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G force meaning3/25/2023 ![]() For that, you need a concept called velocity which describes both the speed and direction (in Physics we call these vectors.)Īcceleration is defined as a change in velocity per unit time, and that allows either the speed or the direction to alter as time goes by. An object can have a speed in a straight line, but this tells you nothing about the direction of travel. Now, to develop this idea we need to clarify what we mean by an acceleration, and Newton’s 1st law. The only force acting is gravity and that acts towards the earth (centre of mass, close to the earth, but again we’ll ignore that for now) causing it to accelerate. A good example is the orbit of the moon (for this argument, a circle) around the earth. When an object turns a corner, or moves in circular motion there only needs to be one force acting (there may be more, but only 1 is required) and that force is centripetal i.e. Where did you hear or read this? What was the situation?įor this to make sense you (probably) need to alter your understanding of how forces work a little. The acceleration might increase with speed in some specific situations. In general, they do not increase with speed. Regarding your 2nd question: why do they increase with speed? It is convenience when acceleration is significantly larger than the acceleration due to gravity to describe it as a multiple of 1 g. That would be called acceleration of 2 g's. Imagine you had a car that could achieve twice the acceleration of free-fall - that would be #19.6 m/s^2# (and that would be amazing). They were not sites that were strict on Physics conventions, but. Note: after writing the above paragraph, I did a search and found several sites using G where I expected g. ![]() This acceleration is also called "acceleration due to gravity". On Earth, the acceleration of a body in free-fall accelerates at 1 g, which has a value of #9.8 m/s^2#. It is used in Newton's formula for gravitational force between 2 bodies. In my experience, G is reserved to be the symbol for the constant of Universal Gravitation.
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