Michael J. answered 07/28/15
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Newton's First Law states that all objects experience a constant motion or remains at rest, unless acted upon an unbalanced force. The sum of the forces is zero.
Newton's Second Law states that when an object of a certain mass is acted upon an unbalanced force, we have acceleration.
F = ma
where:
F = force
m mass
a = acceleration
Newton's third Law states that all forces come in pairs. For every action there is an equal reaction.
F1 = - F2
The two forces have equal magnitude, but opposite direction.