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# Chapter 11 Vocab.

### Forces and Newton's Laws

TermDefinition
velocity the speed and direction of a moving
force a push or pull
net force the combination of all the forces acting on an object
balanced forces two or more forces whose effects cancel each other out and do not change the motion of an object
unbalanced forces two or more forces acting on an object that do not cancel, and cause the object to accelerate
Newton's First Law of Motion if the net force acting on an object is zero, the object remains at rest, or if the object is already moving, continues to move in a straight line with constant speed
friction the force that brings nearly everything to a stop
acceleration the change in velocity divided by the time over which the change occured
Newton's Second Law of Motion the acceleration of an object equals the net force divided by the mass and is in the direction of the net force
weight the size of the gravitational force exerted on a object
center of mass the point an object that moves as if all the object's mass were concentrated at that point
Newton's Third Law of Motion forces always act in equal but opposite pairs
Created by: desgold399