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According to newtons first law, a body remains in constant motion in the same direction, with the same velocity, unless and until an external force acts on it. So when a body in motion comes under the influence an external force, it either,

1) changes in its speed- accelerate or decelerate. OR

2)changes in direction of motion- like when rolling marbles collide with each other and change direction. OR

3) Both of the above changes takes place.

and when a body is in the state of rest, it will remain in rest unless and until acted upon by an external force. (newtons first law)

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15y ago

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