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- (1) An object at rest or moving with constant
- velocity tends to remain at rest or in motion
- with constant velocity unless acted on by an
- outside force.
-
- (2) The net acceleration of an object is
- proportional to the net force acting on it. The
- constant of proportionality is called mass.
-
- (3) If an object is acted on with a force F, it
- reacts with a force -F, equal in magnitude to F
- and opposite in direction.
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