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Chapter 11 Vocab.
Forces and Newton's Laws
| Term | Definition |
|---|---|
| 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 |
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