G-force is the gravitational pull on the body. Positive g-force is what pilots (jet) experience can cause many things, biggest one---blacking out. Negative g-force is weightlessness, like what you experience going down a hill on a roller coster, or what the astronaunts experience in space. With negative force, for extended periods, it causes muscle atropy. I'm sure there are many other effects, those are just the main ones I always think of.
Last edit by CC NRSE on Aug 8, '01
Aug 8, '01
Oh! I love physics!
Positive G force will push the blood in your body towards your feet and resist your heart's attempts to pump it back up to your brain. You will begin to get tunnel vision, then things will lose color and turn white, and finally everything will go black.
Negative Gs will push the blood up into the head, just the opposite of positive Gs. However, while the body can stand up to 9 positive Gs without severe consequences, blood vessels in your eyes will start to rupture when you apply as little as 2 to 3 negative Gs. This is known as redout.. A pilot who pushes too many negative Gs will be seeing the world through bloodshot eyes.
Here's a handy little G-force table:
Ultracentrifuge 300,000 G
Baseball struck by bat 3000 G
Soccer ball struck by foot 300 G
Automobile crash (100 km/h into wall) 100 G
Parachutist during opening of parachute 33 G
Gravity on surface of Sun 27 G
Explosive seat ejection from aircraft 15 G
F16 aircraft pulling out of dive 8 G
Loss of consciousness in man ("blackout") 7 G
Gravity on surface of Earth 1 G
Braking of automobile 0.8 G
Gravity on surface of Moon .17 G
Last edit by fiestynurse on Aug 8, '01
Aug 9, '01
Makes me wonder what's happening to my kid's brain when she goes on all these scary amusement park rides. Does anybody have any information about that? Are there any set limits on G forces for amusement park rides? Some of these rides are becoming pretty extreme!
Last edit by fiestynurse on Aug 9, '01
Last edit by Huganurse on Jun 30, '02