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law of universal gravitation
all objects are attracted to each other and the force of attraction depends upon their masses and distance between them. (ex:planets)
the force between two surfaces in contact that keeps them from sliding when a force is applied.
Newton's first law of motion
If the net force of an object is zero, an object at rest remains at rest, or if the object is moving it continues to move in a straight line with constant speed.
Newton's second law of motion
the acceleration of an object equals the net force divided by the object's mass.
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