Forces and motion
Acceleration is caused by a force, eg gravity or friction, acting on a moving object. The relationship between force, mass and acceleration is expressed in the equation 'force = mass x acceleration'.
The stopping distance of a car depends on two factors - thinking distance and braking distance. Under normal driving conditions, the thinking and braking distance depend on the speed of the car.
When an object accelerates it does so because an extra force is acting on it. For example:
For the same mass:
For the same force:
For the same acceleration:
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