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MOTION MATTERS
The idea that objects only change their velocity due to a force is encapsulated in Newton's first law.
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Newton's second law of motion is F = ma, or force is equal to mass times acceleration.
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.
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