Re-explain the following phrases in terms of momentum a. “an object in motion will remain in motion unless acted upon by an outside force” b. “force is defined as mass times acceleration” c. “for every action there is an equal and opposite reaction”

A. An object in motion will remain in motion unless acted upon by an outside force : The momentum of an object is constant unless an outside force acts on the object.

B. Force is defined as mass times acceleration : the rate of change of the momentum of a particle is proportional to the force F acting on it, hence the force is equal to mass times acceleration.

C. For every action there is an equal and opposite reaction : to every action force there is an equal and opposite reaction force. 

If football was tossed in air without gravity or friction the ball would go into space

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