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Newton’s Laws Vocabulary Vocabulary Force – strength or power exerted/put on an object, a push or pull that causes a change in the motion of an object Acceleration – change of velocity or speed Velocity – the rate of speed with which something happens Speed – rate of motion Friction – the resistance of movement on surfaces that touch. Mass – the amount of matter in an object Gravity – the force of attraction that moves bodies towards the center of the earth. Inertia – the tendency of a body to preserve its state of rest or motion unless acted upon by an external force. Newton (N) – the unit for the amount of force an object contains. Traction – a kind of friction that allows wheels to turn without slipping on a surface. Weight – a measure of the heaviness of an object.