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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.
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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
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For every action there is an equal and opposite reaction.
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