12-2 What is a Force?

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tension

a force that is exerted when matter is pulled or stretched

compression

a force that is exerted when matter is pushed or squeezed

force

a push or pull exerted on an object in order to change the motion of the object; force has size and direction

balanced force

cause no change in motion

unbalanced force

causes a change in velocity

newton

the SI unit for force

net force

the combination of all of the forces acting on an object

FORCES

what always act on objects?


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