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friction the force that opposes the motion of one surface as it moves across another surface force a push or a pull net force the combination of all forces acting on an object balanced force forces on an object that combine to give a zero net force and do not change the motion of the object unbalanced force two or more forces that are not equal and can cause change in motion newton unit of force inertia the tendency of an object to resist any change in its motion Newton's First Law of Motion "An object at rest will remain at rest, and an object moving at a constant velocity will continue moving at a constant velocit, unless it is acted upon by an unbalanced force." Another name is Law of Inertia Newton's Second Law of Motion "Acceleration depends on the objects mass and on the netforce acting on the object." Newton's Third Law of Motion for every action there is an opposite but equal reaction