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?