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The observation that objects in motion tend to stay in motion, and objects at rest tend to stay at rest unless an outside force acts upon them.
Newton's observation that the rate of change of the momentum of a body is directly proportional to, and in the same direction as, the net force acting on it.
rate of change of position, or a speed with the directional component.
Newton's observation that to every action (force applied) there is an equal but opposite reaction (equal force applied in the opposite direction)
(of a body in motion) the product of its mass and velocity.