Newton's Laws of Motion
First Law
In the absence of a NET force acting on it an object at rest will remain
at rest and an object in constant velocity motion will continue in that
constant velocity motion.
Second Law
The NET force acting on an object is equal to the product of the mass and
acceleration of the object. The direction of the force is the same as that
of the acceleration.
Third Law
When an object exerts a force on another object, the second object exerts
on the first a force of the same magnitude, but in the opposite direction.
or
"Action equals Reaction"
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