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# help! can someone answer this? physics GCSE

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1. when a resultant force acts on an object, it causes a change in momentum in the direction of the force.

why?
2. (Original post by esmeralda123)
when a resultant force acts on an object, it causes a change in momentum in the direction of the force.

why?
imagine a car, if the driving force is greater than the air resistance, then it will accelerate and we know momentum is velocity multiplied by speed , so as the velocity of the vehicle increases because it is accelerating, the momentum will also increase.
3. (Original post by esmeralda123)
when a resultant force acts on an object, it causes a change in momentum in the direction of the force.

why?
If the resultant force = 0 on a stationary object it will have no effect, but a moving object will continue to move at the same speed in the same direction
If the resultant force is greater than 0 then a stationary object will speed up in the direction of the resultant force. An object that was already moving will speed up, slow down or change direction in the direction of the resultant force

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