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G forces are the forces riders feel while riding a roller coaster. These are caused by changes in the velocity of that train and the inertia of the rider. They are measured two ways: vertically and laterally. Positive G forces are felt on the car’s path up the hills, where they feel as if they weigh more than they do. This is reversed on the car’s descent where negative G forces occur, causing the riders to feel weightless.
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Scientific Answer:
The acceleration a body internally "experiences" is the apparent weight per unit mass.
It is found by vector addition of the opposite of the actual acceleration (in the sense of rate of change of velocity) and a vector of the local gravity (about 1 g downward for the Earth's surface). For example, being accelerated upward on Earth with an acceleration of 1 g doubles the experienced weight to a g-force of 2 g. Conversely, falling gives an experienced weight of 0 g. A person standing at the top of a mountain experiences a g-force slightly below 1g due to greater distance from the centre of the Earth.
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The term microgravity μg-force indicates a very low g-force, such as might occur for an object in contact with the walls of a space station in low earth orbit due to tidal forces. An object free floating in a space station would be (theoretically) experiencing zero-gravity due to the lack of external forces; neglecting air effects.
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It is a normalized force vector since dividing the resultant force vector applied to a body by the body's weight (magnitude at sea level) cancels the mass, resulting in a "fractional-g" -magnitude vector, e.g. a person sitting on a chair at sea level is experiencing "1g," due to his weight.
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Negative g-forces are often used on roller-coasters. Moments of zero g or negative g's are known as air time. The human body can withstand less negative g's than positive.
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The term scientists have used to describe the effects of gravity's pull on objects and the human body. Most notably used in degrees to rate the different levels of gravitational pull, especially for Air Force pilots, Astronauts, and even on theme park rides.It's normally gravity.
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Though it can be reproduced with forward motion - you feel it pinning you in your seat when you accelerate.
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When talking about cars, G-force can be calculated for 1. acceleration, 2. braking, and 3. "lateral acceleration" meaning turning.When quoted for a car/tire combination, it is usually this lateral acceleration. This is the maximum turning force that is generated on cornering for a set-up.
Almost no street car exceeds 1 G, where Indy Cars pull 3 G's on a regular basis. In fact the intent in Open wheel racing is to pull the maximum G force possible on a continuous basis.
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