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Motion is a change in position of an object over time.

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A force is any interaction that, when unopposed, will change the motion of an object.

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Mass is a property of a physical body. It is the measure of an object's resistance to acceleration (a change in its state of motion) when a net force is applied.

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The force that attracts a body toward the center of earth, or toward any other physical body having mass.

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Inertia is the resistance of any physical object to any change in its state of its motion.

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Velocity is a physical vector quantity, both magnitude and direction are needed to define it.

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Acceleration is defined as the rate of change of velocity.

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The resistance that one surface or object encounters when moving over another.

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Newton's third law of motion states that for every action, there is an equal and opposite reaction.

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Newton's second law of motion states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as a net force, and inversely proportional to the mass of the object.

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Newton's first law of motion states that an object at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.