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An object continues in a state of rest or in a state of motion at a constant speed along a straight line, unless compelled to

change that state by a net force.

-which means-

An object does not need need to be under the influence of a force to be in motion!

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A net force (ΣF) on an object of mass (m) results in an acceleration (a) according to the following formula:

ΣF=ma

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If two object interact, the force exerted by object 1 on 2 is equal in magnitude and opposite in

direction to the force exerted by object 2 on 1 :

F12= -F21

-In other words-

For every action there is an equal and opposite reaction.

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