net force - combination of all the forces acting on an object, friction - force that opposes the motion of any object, law of inertia - an object's motion will not change unless an unbalanced force acts on it., mass - factor that determines the inertia of an object, unbalanced force - type of force needed to overcome inertia of an object, inertia - tendency of an object to resist a change in motion,

Lesson 14.1 Newton's First Law of Motion-2

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