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### 13 Cards in this Set

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 weight the measure of the pull of gravity on an object mass the amount of matter (stuff) in an object. More mass=more weight balanced force Equal forces that act on an object in opposite direction unbalanced force changes the speed or direction of an object gravity the force that pulls objects towards the center of the earth. Inertia the tendency of an object to resist in any change in its motion speed the distance an object travels in a unit of time acceleration Any change in the speed or direction of an object Newtons 1st law An object in motion will remain in motion and an object at rest will remain at rest unless acted by an outside force. newtons 2nd law F=Mass X acceleration. The acceleration of an object depends on its mass & the force acting on it Newtons 3rd Law For every action there is an equal and opposite reaction Force A push or pull on an object Friction A force that oppresses the motion