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g-force
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This article is about a type of acceleration. For other uses, see G-Force (disambiguation).
This article is about effects of long acceleration. For transient acceleration, see mechanical shock.
In straight and level flight, lift (L) equals weight (W). In a banked turn of 60°, lift equals double the weight (L=2W). The pilot experiences 2 g and a doubled weight. The steeper the bank, the greater the g-forces.
This top-fuel dragster can accelerate from zero to 160 kilometres per hour (99 mph) in 0.86 seconds. This is a horizontal acceleration of 5.3 g. Combined with the vertical g-force in the stationary case the Pythagorean theorem yields a g force of 5.4 g.
The g-force (with g from gravitational) is a measurement of the type of acceleration that causes a perception of weight. Despite the name, it is incorrect to consider g-force a fundamental force, as "g-force" (lower case character) is a type of acceleration that can be measured with an accelerometer. Since g-force accelerations indirectly produce weight, any g-force can be described as a "weight per unit mass" (see the synonym specific weight). When the g-force acceleration is produced by the surface of one object being pushed by the surface of another object, the reaction-force to this push produces an equal and opposite weight for every unit of an object's mass. The types of forces involved are transmitted through objects by interior mechanical stresses. The g-force acceleration (save for certain electromagnetic force influences) is the cause of an object's acceleration in relation to free-fall.[1][2]
The g-force acceleration experienced by an object is due to the vector sum of all non-gravitational and non-electromagnetic forces acting on an object's freedom to move. In practice, as noted, these are surface-contact forces between objects. Such forces cause stresses and strains on objects, since they must be transmitted from an object surface. Because of these strains, large g-forces may be destructive.
Gravitation acting alone does not produce a g-force, even though g-forces are expressed in multiples of the acceleration of a standard gravity. Thus, the standard gravitational acceleration at the Earth's surface produces g-force only indirectly, as a result of resistance to it by mechanical forces. These mechanical forces actually produce the g-force acceleration on a mass. For example, the 1 g force on an object sitting on the Earth's surface is caused by mechanical force exerted in the upward direction by the ground, keeping the object from going into free-fall. The upward contact-force from the ground ensures that an object at rest on the Earth's surface is accelerating relative to the free-fall condition. (Free fall is the path that the object would follow when falling freely toward the Earth's center). Stress inside the object is ensured from the fact that the ground contact forces are transmitted only from the point of contact with the ground.
Objects allowed to free-fall in an inertial trajectory under the influence of gravitation only, feel no g-force acceleration, a condition known as zero-g (which means zero g-force). This is demonstrated by the "zero-g" conditions inside a freely falling elevator falling toward the Earth's center (in vacuum), or (to good approximation) conditions inside a spacecraft in Earth orbit. These are examples of coordinate acceleration (a change in velocity) without a sensation of weight. The experience of no g-force (zero-g), however it is produced, is synonymous with weightlessness.
In the absence of gravitational fields, or in directions at right angles to them, proper and coordinate accelerations are the same, and any coordinate acceleration must be produced by a corresponding g-force acceleration. An example here is a rocket in free space, in which simple changes in velocity are produced by the engines, and produce g-forces on the rocket and passengers.
Contents
[hide]
1 Unit and measurement
2 Acceleration and forces
3 Human tolerance
3.1 Vertical
3.2 Horizontal
4 Short duration shock, impact, and jerk
5 Other biological responses
6 Typical examples
7 Measurement using an accelerometer
8 See also
9 References
10 Further reading
11 External links
Unit and measurement[edit]
The unit of measure of acceleration in the International System of Units (SI) is m/s2. However, to distinguish acceleration relative to free-fall from simple acceleration (rate of change of velocity), the unit g (or g) is often used. One g is the acceleration due to gravity at the Earth's surface and is the standard gravity (symbol: gn), defined as 7000980665000000000♠9.80665 metres per second squared,[3] or equivalently 7000980665000000000♠9.80665 newtons of force per kilogram of mass. Note that the unit definition does not vary with location—the g-force when standing on the moon is about 0.181 g.
The unit g is not one of the SI units, which uses "g" for gram. Also, "g" should not be confused with "G", which is the standard symbol for the gravitational constant.[4] This notation is commonly used in aviation, especially in aerobatic or combat military aviation, to describe the increased forces that must be overcome by pilots in order to remain conscious and not G-LOC (G-induced loss of consciousness).[5]
Measurement of g-force is typically achieved using an accelerometer (see discussion below in Measuring g-force using an accelerometer). In certain cases, g-forces may be measured using suitably calibrated scales. Specific force is another name that has been used for g-force.
Acceleration and forces[edit]
The term g-force is technically incorrect as it is a measure of acceleration, not force. While acceleration is a vector quantity, g-force accelerations ("g-forces" for short) are often expressed as a scalar, with positive g-forces pointing downward (indicating upward acceleration), and negative g-forces pointing upward. Thus, a g-force is a vector acceleration. It is an acceleration that must be produced by a mechanical force, and cannot be produced by simple gravitation. Objects acted upon only by gravitation, experience (or "feel") no g-force, and are weightless.
G-forces, when multiplied by a mass upon which they act, are associated with a certain type of mechanical force in the correct sense of the term force, and this force produces compressive stress and tensile stress. Such forces result in the operational sensation of weight, but the equation carries a sign change due to the definition of positive weight in the direction downward, so the direction of weight-force is opposite to the direction of g-force acceleration:
Weight = mass × −g-force
The reason for the minus sign is that the actual force (i.e., measured weight) on an object produced by a g-force is in the opposite direction to the sign of the g-force, since in physics, weight is not the force that produces the acceleration, but rather the equal-and-opposite reaction force to it. If the direction upward is taken as positive (the normal cartesian convention) then positive g-force (an acceleration vector that points upward) produces a force/weight on any mass, that acts downward (an example is positive-g acceleration of a rocket launch, producing downward weight). In the same way, a negative-g force is an acceleration vector downward (the negative direction on the y axis), and this acceleration downward produces a weight-force in a direction upward (thus pulling a pilot upward out of the seat, and forcing blood toward the head of a normally oriented pilot).
If a g-force (acceleration) is vertically upward and is applied by the ground (which is accelerating through space-time) or applied by the floor of an elevator to a standing person, most of the body experiences compressive stress which at any height, if multiplied by the area, is the related mechanical force, which is the product of the g-force and the supported mass (the mass above the level of support, including arms hanging down from above that level). At the same time, the arms themselves experience a tensile stress, which at any height, if multiplied by the area, is again the related mechanical force, which is the product of the g-force and the mass hanging below the point of mechanical support. The mechanical resistive force spreads from points of contact with the floor or supporting structure, and gradually decreases toward zero at the unsupported ends (the top in the case of support from below, such as a seat or the floor, the bottom for a hanging part of the body or object). With compressive force counted as negative tensile force, the rate of change of the tensile force in the direction of the g-force, per unit mass (the change between parts of the object such that the slice of the object between them has unit mass), is equal to the g-force plus the non-gravitational external forces on the slice, if any (counted positive in the direction opposite to the g-force).
For a given g-force the stresses are the same, regardless of whether this g-force is caused by mechanical resistance to gravity, or by a coordinate-acceleration (change in velocity) caused by a mechanical force, or by a combination of these. Hence, for people all mechanical forces feels exactly the same whether they cause coordinate acceleration or not. For objects likewise, the question of whether they can withstand the mechanical g-force without damage is the same for any type of g-force. For example, upward acceleration (e.g., increase of speed when going up or decrease of speed when going down) on Earth feels the same as being stationary on a celestial body with a higher surface gravity. Gravitation acting alone does not produce any g-force; g-force is only produced from mechanical pushes and pulls. For a free body (one that is free to move in space) such g-forces only arise as the "inertial" path that is the natural effect of gravitation, or the natural effect of the inertia of mass, is modified. Such modification may only arise from influences other than gravitation.
Examples of important situations involving g-forces include:
The g-force acting on a stationary object resting on the Earth's surface is 1 g (upwards) and results from the resisting reaction of the Earth's surface bearing upwards equal to an acceleration of 1 g, and is equal and opposite to gravity. The number 1 is approximate, depending on location.
The g-force acting on an object in any weightless environment such as free-fall in a vacuum is 0 g.
The g-force acting on an object under acceleration can be much greater than 1 g, for example, the dragster pictured at top right can exert a horizontal g-force of 5.3 when accelerating.
The g-force acting on an object under acceleration may be downwards, for example when cresting a sharp hill on a roller coaster.
If there are no other external forces than gravity, the g-force in a rocket is the thrust per unit mass. Its magnitude is equal to the thrust-to-weight ratio times g, and to the consumption of delta-v per unit time.
In the case of a shock, e.g., a collision, the g-force can be very large during a short time.
A classic example of negative g-force is in a fully inverted roller coaster which is accelerating (changing velocity) toward the ground. In this case, the roller coaster riders are accelerated toward the ground faster than gravity would accelerate them, and are thus pinned upside down in their seats. In this case, the mechanical force exerted by the seat causes the g-force by altering the path of the passenger downward in a way that differs from gravitational acceleration. The difference in downward motion, now faster than gravity would provide, is caused by the push of the seat, and it results in a g-force toward the ground.
All "coordinate accelerations" (or lack of them), are described by Newton's laws of motion as follows:
The Second Law of Motion, the law of acceleration states that: F = ma., meaning that a force F acting on a body is equal to the mass m of the body times its acceleration a.
The Third Law of Motion, the law of reciprocal actions states that: all forces occur in pairs, and these two forces are equal in magnitude and opposite in direction. Newton's third law of motion means that not only does gravity behave as a force acting downwards on, say, a rock held in your hand but also that the rock exerts a force on the Earth, equal in magnitude and opposite in direction.
This acrobatic airplane is pulling up in a +g maneuver; the pilot is experiencing several g's of inertial acceleration in addition to the force of gravity. The cumulative vertical axis forces acting upon his body make him momentarily 'weigh' many times more than normal.
In an airplane, the pilot’s seat can be thought of as the hand holding the rock, the pilot as the rock. When flying straight and level at 1 g, the pilot is acted upon by the force of gravity. His weight (a downward force) is 725 newtons (163 lbf). In accordance with Newton’s third law, the plane and the seat underneath the pilot provides an equal and opposite force pushing upwards with a force of 725 N (163 lbf). This mechanical force provides the 1.0 g-force upward proper acceleration on the pilot, even though this velocity in the upward direction does not change (this is similar to the situation of a person standing on the ground, where the ground provides this force and this g-force).
If the pilot were suddenly to pull back on the stick and make his plane accelerate upwards at 9.8 m/s2, the total g‑force on his body is 2 g, half of which comes from the seat pushing the pilot to resist gravity, and half from the seat pushing the pilot to cause his upward acceleration—a change in velocity which also is a proper acceleration because it also differs from a free fall trajectory. Considered in the frame of reference of the plane his body is now generating a force of 1,450 N (330 lbf) downwards into his seat and the seat is simultaneously pushing upwards with an equal force of 1,450 N (330 lbf).
Unopposed acceleration due to mechanical forces, and consequentially g-force, is experienced whenever anyone rides in a vehicle because it always causes a proper acceleration, and (in the absence of gravity) also always a coordinate acceleration (where velocity changes). Whenever the vehicle changes either direction or speed, the occupants feel lateral (side to side) or longitudinal (forward and backwards) forces produced by the mechanical push of their seats.
The expression "1 g = 7000980665000000000♠9.80665 m/s2" means that for every second that elapses, velocity changes 7000980665000000000♠9.80665 meters per second (≡7000980665000000000♠35.30394 km/h). This rate of change in velocity can also be denoted as 7000980665000000000♠9.80665 (meter per second) per second, or 7000980665000000000♠9.80665 m/s2. For example: An acceleration of 1 g equates to a rate of change in velocity of approximately 35 kilometres per hour (22 mph) for each second that elapses. Therefore, if an automobile is capable of braking at 1 g and is traveling at 35 kilometres per hour (22 mph) it can brake to a standstill in one second and the driver will experience a deceleration of 1 g. The automobile traveling at three times this speed, 105 km/h (65 mph), can brake to a standstill in three seconds.
In the case of an increase in speed from 0 to v with constant acceleration within a distance of s this acceleration is v2/(2s).
Preparing an object for g-tolerance (not getting damaged when subjected to a high g-force) is called g-hardening.[citation needed] This may apply to, e.g., instruments in a projectile shot by a gun.
Human tolerance[edit]
See also: Jerk (physics) § Physiological effects and human perception
Semilog graph of the limits of tolerance of humans to linear acceleration[6]
Human tolerances depend on the magnitude of the g-force, the length of time it is applied, the direction it acts, the location of application, and the posture of the body.[7][8]:350
The human body is flexible and deformable, particularly the softer tissues. A hard slap on the face may briefly impose hundreds of g locally but not produce any real damage; a constant 16 g for a minute, however, may be deadly. When vibration is experienced, relatively low peak g levels can be severely damaging if they are at the resonance frequency of organs or connective tissues.
To some degree, g-tolerance can be trainable, and there is also considerable variation in innate ability between individuals. In addition, some illnesses, particularly cardiovascular problems, reduce g-tolerance.
Vertical[edit]
Aircraft pilots (in particular) sustain g-forces along the axis aligned with the spine. This causes significant variation in blood pressure along the length of the subject's body, which limits the maximum g-forces that can be tolerated.
Positive, or "upward" g, drives blood downward to the feet of a seated or standing person (more naturally, the feet and body may be seen as being driven by the upward force of the floor and seat, upward around the blood). Resistance to positive g varies. A typical person can handle about 5 g0 (49 m/s2) (meaning some people might pass out when riding a higher-g roller coaster, which in some cases exceeds this point) before losing consciousness, but through the combination of special g-suits and efforts to strain muscles—both of which act to force blood back into the brain—modern pilots can typically handle a sustained 9 g0 (88 m/s2) (see High-G training)[citation needed].
In aircraft particularly, vertical g-forces are often positive (force blood towards the feet and away from the head); this causes problems with the eyes and brain in particular. As positive vertical g-force is progressively increased (such as in a centrifuge) the following symptoms may be experienced:
Grey-out, where the vision loses hue, easily reversible on levelling out.
Tunnel vision, where peripheral vision is progressively lost.
Blackout, a loss of vision while consciousness is maintained, caused by a lack of blood to the head.
G-LOC, a g-force induced loss of consciousness.[9]
Death, if g-forces are not quickly reduced, death can occur.[10]
Resistance to "negative" or "downward" g, which drives blood to the head, is much lower. This limit is typically in the −2 to −3 g0 (−20 to −29 m/s2) range. This condition is sometimes referred to as red out where vision is figuratively reddened[11] due to the blood laden lower eyelid being pulled into the field of vision[12] Negative g is generally unpleasant and can cause damage. Blood vessels in the eyes or brain may swell or burst under the increased blood pressure, resulting in degraded sight or even blindness.
Horizontal[edit]
The human body is better at surviving g-forces that are perpendicular to the spine. In general when the acceleration is forwards (subject essentially lying on their back, colloquially known as "eyeballs in"[13]) a much higher tolerance is shown than when the acceleration is backwards (lying on their front, "eyeballs out") since blood vessels in the retina appear more sensitive in the latter direction[citation needed].
Early experiments showed that untrained humans were able to tolerate a range of accelerations depending on the time of exposure. This ranged from as much as 20 g for less than 10 seconds, to 10 g for 1 minute, and 6 g for 10 minutes for both eyeballs in and out.[14] These forces were endured with cognitive facilities intact, as subjects were able to perform simple physical and communication tasks. The tests were determined to not cause long or short term harm although tolerance was quite subjective, with only the most motivated non-pilots capable of completing tests.[15] The record for peak experimental horizontal g-force tolerance is held by acceleration pioneer John Stapp, in a series of rocket sled deceleration experiments culminating in a late 1954 test in which he was clocked in a little over a second from a land speed of Mach 0.9. He survived a peak "eyeballs-out" acceleration of 46.2 times the acceleration of gravity, and more than 25 g for 1.1 seconds, proving that the human body is capable of this. Stapp lived another 45 years to age 89[16] without any ill effects.[17]
The highest recorded G-force experienced by someone who lived to tell the tale occurred in an Indycar motor race when a car driven by Kenny Bräck impacted a catch fence and recorded a peak force of 214 g. Although he experienced multiple fractures he made a full recovery.[18][19]
Short duration shock, impact, and jerk[edit]
Impact and mechanical shock are usually used to describe a high kinetic energy, short term excitation. A shock pulse is often measured by its peak acceleration in g-s and the pulse duration. Vibration is a periodic oscillation which can also be measured in g-s as well as frequency. The dynamics of these phenomena are what distinguish them from the g-forces caused by a relatively longer term accelerations.
After a free fall from a height h {\displaystyle h} the shock on an object during impact is h / d {\displaystyle h/d} g, where d {\displaystyle d} is the distance covered during the impact. For example, a stiff and compact object dropped from 1 m that impacts over a distance of 1 mm is subjected to a 1000 g deceleration.
Jerk is the rate of change of acceleration. In SI units, jerk is expressed as m/s3; it can also be expressed in standard gravity per second (g/s; 1 g/s ≈ 9.81 m/s3).
Other biological responses[edit]
Recent research carried out on extremophiles in Japan involved a variety of bacteria including E. coli and Paracoccus denitrificans being subject to conditions of extreme gravity. The bacteria were cultivated while being rotated in an ultracentrifuge at high speeds corresponding to 403,627 g. Paracoccus denitrificans was one of the bacteria which displayed not only survival but also robust cellular growth under these conditions of hyperacceleration which are usually only to be found in cosmic environments, such as on very massive stars or in the shock waves of supernovas. Analysis showed that the small size of prokaryotic cells is essential for successful growth under hypergravity. The research has implications on the feasibility of panspermia.[20][21]
Typical examples[edit]
Main article: Orders of magnitude (acceleration)
Example
g-force*
The gyro rotors in Gravity Probe B and the free-floating proof masses in the TRIAD I navigation satellite[22] 0 g
A ride in the Vomit Comet (parabolic flight) ≈ 0 g
Standing on the Moon at its equator 0.1654 g
Standing on the Earth at sea level–standard 1 g
Saturn V moon rocket just after launch 1.14 g
Bugatti Veyron from 0 to 100 km/h in 2.4 s 1.55 g†
Gravitron amusement ride 2.5-3 g
Space Shuttle, maximum during launch and reentry 3 g
High-g roller coasters[8]:340 3.5–6.3 g
Top Fuel drag racing world record of 4.4 s over 1/4 mile 4.2 g
First world war aircraft (ex:Sopwith Camel, Fokker Dr.1, SPAD S.XIII, Nieuport 17, Albatros D.III) in dogfight maneuvering. 4.5–7 g
Formula One car, maximum under heavy braking[23] 6.3 g
Formula One car, peak lateral in turns[24] 6–6.5 g
Luge, maximum expected at the Whistler Sliding Centre 5.2 g
Standard, full aerobatics certified glider +7/−5 g
Apollo 16 on reentry[25] 7.19 g
Maximum permitted g-force turn in Red Bull Air Race plane 10g
Maximum for human on a rocket sled 46.2 g
Sprint missile 100 g
Brief human exposure survived in crash[26][27] > 100 g
Space gun with a barrel length of 1 km and a muzzle velocity of 6 km/s, as proposed by Quicklaunch (assuming constant acceleration) 1,800 g
Shock capability of mechanical wrist watches[28] > 5,000 g
V8 Formula One engine, maximum piston acceleration [29] 8,600 g
Rating of electronics built into military artillery shells[30] 15,500 g
Analytical ultracentrifuge spinning at 60,000 rpm, at the bottom of the analysis cell (7.2 cm)[31] 300,000 g
Mean acceleration of a proton in the Large Hadron Collider[32] 190,000,000 g
Gravitational acceleration at the surface of a typical neutron star[33] 7008200000000000000♠2.0×1011 g
Acceleration from a wakefield plasma accelerator[34] 7017890000000000000♠8.9×1020 g
* Including contribution from resistance to gravity.
† Directed 40 degrees from horizontal.
Measurement using an accelerometer[edit]
The Superman: Escape from Krypton roller coaster at Six Flags Magic Mountain provides 6.5 seconds of ballistic weightlessness.
An accelerometer, in its simplest form, is a damped mass on the end of a spring, with some way of measuring how far the mass has moved on the spring in a particular direction, called an 'axis'.
Accelerometers are often calibrated to measure g-force along one or more axes. If a stationary, single-axis accelerometer is oriented so that its measuring axis is horizontal, its output will be 0 g, and it will continue to be 0 g if mounted in an automobile traveling at a constant velocity on a level road. When the driver presses on the brake or gas pedal, the accelerometer will register positive or negative acceleration.
If the accelerometer is rotated by 90° so that it is vertical, it will read +1 g upwards even though stationary. In that situation, the accelerometer is subject to two forces: the gravitational force and the ground reaction force of the surface it is resting on. Only the latter force can be measured by the accelerometer, due to mechanical interaction between the accelerometer and the ground. The reading is the acceleration the instrument would have if it were exclusively subject to that force.
A three-axis accelerometer will output zero‑g on all three axes if it is dropped or otherwise put into a ballistic trajectory (also known as an inertial trajectory), so that it experiences "free fall," as do astronauts in orbit (astronauts experience small tidal accelerations called microgravity, which are neglected for the sake of discussion here). Some amusement park rides can provide several seconds at near-zero g. Riding NASA's "Vomit Comet" provides near-zero g for about 25 seconds at a time.
See also[edit]
Artificial gravity
Earth's gravity
Euthanasia Coaster
Gravitational acceleration
Gravitational interaction
Load factor (aeronautics)
Peak ground acceleration – g-force of earthquakes
Relation between g-force and apparent weight
Shock and vibration data logger
Shock detector
References[edit]
Jump up ^ G Force. Newton.dep.anl.gov. Retrieved on 2011-10-14.
Jump up ^ Sircar, Sabyasachi (2007-12-12). "Principles of Medical Physiology". ISBN 978-1-58890-572-7.
Jump up ^ BIPM: Declaration on the unit of mass and on the definition of weight; conventional value of gn
Jump up ^ Symbol g: ESA: GOCE, Basic Measurement Units, NASA: Multiple G, Astronautix: Stapp, Honeywell: Accelerometers, Sensr LLC: GP1 Programmable Accelerometer, Farnell: accelometers, Delphi: Accident Data Recorder 3 (ADR3) MS0148, NASA: Constants and Equations for Calculations, Jet Propulsion Laboratory: A Discussion of Various Measures of Altitude Archived 2009-02-10 at the Wayback Machine., Vehicle Safety Research Centre Loughborough: Use of smart technologies to collect and retain crash information, National Highway Traffic Safety Administration: Recording Automotive Crash Event Data

Symbol G: Lyndon B. Johnson Space Center: ENVIRONMENTAL FACTORS: BIOMEDICAL RESULTS OF APOLLO, Section II, Chapter 5 Archived 2008-11-22 at the Wayback Machine., Honywell: Model JTF, General Purpose Accelerometer Archived March 2, 2009, at the Wayback Machine.
Jump up ^ "Pulling G's". Go Flight Medicine. Retrieved 24 Sep 2014.
Jump up ^ Robert V. Brulle (2008). Engineering the Space Age: A Rocket Scientist Remembers (PDF). Air University Press. p. 135. ISBN 978-1-58566-184-8.
Jump up ^ Balldin, Ulf I. (2002). "Chapter 33: Acceleration effects on fighter pilots." (PDF). In Lounsbury, Dave E. Medical conditions of Harsh Environments. 2. Washington, DC: Office of The Surgeon General, Department of the Army, United States of America. ISBN 9780160510717. OCLC 49322507. Retrieved 2013-09-16.
^ Jump up to: a b George Bibel. Beyond the Black Box: the Forensics of Airplane Crashes. Johns Hopkins University Press, 2008. ISBN 0-8018-8631-7.
Jump up ^ Burton RR (1988). "G-induced loss of consciousness: definition, history, current status". Aviation, Space, and Environmental Medicine. 59 (1): 2–5. PMID 3281645.
Jump up ^ The Science of G Force- Joshua Davis
Jump up ^ Brown, Robert G (1999). "On the edge: Personal flying experiences during the Second World War". ISBN 978-1-896182-87-2.
Jump up ^ DeHart, Roy L. (2002). Fundamentals of Aerospace Medicine: 3rd Edition. Lippincott Williams & Wilkins.
Jump up ^ "NASA Physiological Acceleration Systems". Web.archive.org. 2008-05-20. Archived from the original on 2008-05-20. Retrieved 2012-12-25.
Jump up ^ NASA Technical note D-337, Centrifuge Study of Pilot Tolerance to Acceleration and the Effects of Acceleration on Pilot Performance, by Brent Y. Creer, Captain Harald A. Smedal, USN (MC), and Rodney C. Vtlfngrove, figure 10
Jump up ^ NASA Technical note D-337, Centrifuge Study of Pilot Tolerance to Acceleration and the Effects of Acceleration on Pilot Performance, by Brent Y. Creer, Captain Harald A. Smedal, USN (MC), and Rodney C. Vtlfngrove
Jump up ^ Fastest Man on Earth- John Paul Stapp. Ejection Site. Retrieved on 2011-10-14.
Jump up ^ Martin, Douglas (16 November 1999). "John Paul Stapp, 89, Is Dead; 'The Fastest Man on Earth'". The New York Times. Retrieved 29 October 2016.
Jump up ^ http://www.news.com.au/sport/motorsport/formula-one/jules-bianchi-survived-92g-impact-in-horror-formula-one-crash/news-story/c381589f42393105511f8413c3b2fd52
Jump up ^ http://www.crash.net/indycar/news/20962/1/qa-kenny-brack.html
Jump up ^ Than, Ker (25 April 2011). "Bacteria Grow Under 400,000 Times Earth's Gravity". National Geographic- Daily News. National Geographic Society. Retrieved 28 April 2011.
Jump up ^ Deguchi, Shigeru; Hirokazu Shimoshige; Mikiko Tsudome; Sada-atsu Mukai; Robert W. Corkery; Susumu Ito; Koki Horikoshi (2011). "Microbial growth at hyperaccelerations up to 403,627 xg". Proceedings of the National Academy of Sciences. 108 (19): 7997. Bibcode:2011PNAS..108.7997D. doi:10.1073/pnas.1018027108. Retrieved 28 April 2011.
Jump up ^ Stanford University: Gravity Probe B, Payload & Spacecraft, and NASA: Investigation of Drag-Free Control Technology for Earth Science Constellation Missions. The TRIAD 1 satellite was a later, more advanced navigation satellite that was part of the U.S. Navy’s Transit, or NAVSAT system.
Jump up ^ https://www.youtube.com/watch?v=zJRh9FG83d0&ab_channel=FORMULA1. Missing or empty |title= (help)
Jump up ^ 6 g has been recorded in the 130R turn at Suzuka circuit, Japan. "Archived copy". Archived from the original on 2010-02-28. Retrieved 2012-10-12. Many turns have 5 g peak values, like turn 8 at Istanbul or Eau Rouge at Spa
Jump up ^ NASA: Table 2: Apollo Manned Space Flight Reentry G Levels
Jump up ^ "Several Indy car drivers have withstood impacts in excess of 100 G without serious injuries." Dennis F. Shanahan, M.D., M.P.H.: "Human Tolerance and Crash Survivability, citing Society of Automotive Engineers. Indy racecar crash analysis. Automotive Engineering International, June 1999, 87–90. And National Highway Traffic Safety Administration: Recording Automotive Crash Event Data
Jump up ^ David Purley
Jump up ^ Omega [1], Ball Watch Technology
Jump up ^ Cosworth V8 engine ; Up to 10,000 g before rev limits
Jump up ^ "L-3 Communication's IEC Awarded Contract with Raytheon for Common Air Launched Navigation System".
Jump up ^ (rpm·π/30)2·0.072/g
Jump up ^ (7 TeV/(20 minutes·c))/proton mass
Jump up ^ Green, Simon F.; Jones, Mark H.; Burnell, S. Jocelyn (2004). An Introduction to the Sun and Stars (illustrated ed.). Cambridge University Press. p. 322. ISBN 978-0-521-54622-5. Extract of page 322 note: 7012200000000000000♠2.00×1012 ms−2 = 7008204000000000000♠2.04×1011 g
Jump up ^ (42 GeV/85 cm)/electron mass
Further reading[edit]
Faller, James E. (November–December 2005). "The Measurement of Little g: A Fertile Ground for Precision Measurement Science" (PDF). Journal of Research of the National Institutes of Standards and Technology. 110 (6): 559–581.
External links[edit]
"How Many Gs Can a Flyer Take?", October 1944, Popular Science one of the first detailed public articles explaining this subject
Enduring a human centrifuge at the NASA Ames Research Center At Wired
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The Best of Times (film)
From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
For other uses, see The Best of Times.
The Best of Times
Theatrical release poster
Directed by
Roger Spottiswoode
Produced by
Gordon Carroll
Written by
Ron Shelton
Starring
Robin Williams
Kurt Russell
Pamela Reed
Donald Moffat
Music by
Arthur B. Rubinstein
Cinematography
Charles F. Wheeler
Edited by
Garth Craven
Production
company
Kings Road Entertainment
Distributed by
Universal Studios
Release date
January 31, 1986 (1986-01-31) (USA)
Running time
104 min.
Country
United States
Language
English
Box office
$7,790,931 (USA)[1]
The Best of Times is a 1986 American comedy-drama film directed by Roger Spottiswoode and written by Ron Shelton. It stars Robin Williams and Kurt Russell as two friends attempting to relive a high school football game.
Contents
[hide]
1 Plot
2 Cast
3 Production
4 Reception
5 References
6 External links
Plot[edit]
Jack Dundee (Williams) is a banker obsessed with what he considers the most shameful moment in his life: dropping a perfectly thrown pass in the final seconds of the 1972 high school football game between Taft and their arch rivals, Bakersfield, which ended in a scoreless tie.
Since that game, Jack has found it impossible to forget this event. He works for his father-in-law, The Colonel, Bakersfield's biggest supporter, who reminds him of the event almost daily.
Thirteen years later, Jack coerces Reno (Russell), quarterback of the fateful game, and now a financially struggling garage owner in debt to Jack's bank, into helping him replay the game. He convinces supporters in both towns to re-stage the game and in the process revitalizes Taft, as well as his and Reno's marriages.
Cast[edit]
Robin Williams as Jack Dundee
Kurt Russell as Reno Hightower
Pamela Reed as Gigi Hightower
Holly Palance as Elly Dundee
Donald Moffat as The Colonel
Margaret Whitton as Darla
M. Emmet Walsh as Charlie
Donovan Scott as Eddie
R. G. Armstrong as Schutte
Dub Taylor as Mac
Carl Ballantine as Arturo
Kathleen Freeman as Rosie
Tony Plana as Chico
Kirk Cameron as Teddy
Robyn Lively as Jacki
Jeff Doucette as Olin
Anne Haney as Marcy
Linda Hart as Blender #1
Tracey Gold as Jaki's friend (uncredited)
Wayne Adderson as Bakersfield coach.
Production[edit]
Much of the film was shot in and around the actual Taft Union High School. The football scenes took place at Pierce Junior College in the San Fernando Valley. The night game was filmed at Moorpark Memorial High School, in Moorpark, CA.
Reception[edit]
The film received mixed reviews, with a 33% 'rotten' rating on review aggregate Rotten Tomatoes.[2] Pauline Kael called the film "a small town comedy where the whole population is caught up in some glorious foolishness."[3]
References[edit]
Jump up ^ The Best of Times at Box Office Mojo
Jump up ^ "The Best of Times". Rotten Tomatoes.
Jump up ^ Kael, Pauline. Hooked. p. 110. ISBN 0-7145-2903-6.
External links[edit]
The Best of Times on IMDb
The Best of Times at Rotten Tomatoes
The Best of Times at the TCM Movie Database
hide
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Films directed by Roger Spottiswoode
Terror Train (1980)
The Pursuit of D. B. Cooper (1981)
Under Fire (1983)
The Best of Times (1986)
The Last Innocent Man (1987)
Shoot to Kill (1988)
Third Degree Burn (1989)
Turner & Hooch (1989)
Air America (1990)
Stop! Or My Mom Will Shoot (1992)
And the Band Played On (1993)
Mesmer (1994)
Hiroshima (1995)
Murder Live! (1997)
Tomorrow Never Dies (1997)
Noriega: God's Favorite (2000)
The 6th Day (2000)
The Matthew Shepard Story (2002)
Ice Bound: A Woman's Survival at the South Pole (2003)
Spinning Boris (2003)
Ripley Under Ground (2005)
Shake Hands with the Devil (2007)
The Children of Huang Shi (2008)
Beyond Right and Wrong (2012)
Midnight Sun (2014)
A Street Cat Named Bob (2016)
The Beach House (2018)

This article about a 1980s comedy-drama film is a stub. You can help Wikipedia by expanding it.
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1986 films
1980s comedy-drama films
American films
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American sports comedy films
Films directed by Roger Spottiswoode
Films set in California
Universal Pictures films
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text:
Pulmonary stretch receptors
From Wikipedia, the free encyclopedia
Jump to: navigation, search
Pulmonary stretch receptors are mechanoreceptors found in the lungs.
When the lung expands, the receptors initiate the Hering-Breuer reflex, which reduces the respiratory rate. Increased firing from the stretch receptors also increases production of pulmonary surfactant. Intercostal muscles and diaphragm receive impulses from the respiratory center, stretch receptors in the lungs send impulses to the respiratory center giving information about the state of the lungs.
See also[edit]
Stretch receptor
External links[edit]
Pulmonary stretch receptors at the US National Library of Medicine Medical Subject Headings (MeSH)
[hide]
v
t
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Respiratory physiology
Respiration
breath
inhalation
exhalation
respiratory rate
respirometer
pulmonary surfactant
compliance
elastic recoil
hysteresivity
airway resistance
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Control
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Lung function tests
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peak flow meter
nitrogen washout
Circulation
pulmonary circulation
hypoxic pulmonary vasoconstriction
pulmonary shunt
Interactions
ventilation (V)
Perfusion (Q)
Ventilation/perfusion ratio
V/Q scan
zones of the lung
gas exchange
pulmonary gas pressures
alveolar gas equation
alveolar–arterial gradient
hemoglobin
oxygen–haemoglobin dissociation curve (Oxygen saturation
2,3-BPG
Bohr effect
Haldane effect)
carbonic anhydrase (chloride shift)
oxyhemoglobin
respiratory quotient
arterial blood gas
diffusion capacity (DLCO)
Insufficiency
high altitude
oxygen toxicity
hypoxia

This respiratory system article is a stub. You can help Wikipedia by expanding it.
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