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webb
19 Force & Newton's Laws
| Question | Answer |
|---|---|
| velocity | the speed and direction of moving object |
| force | a push or a pull |
| net force | the combination of all the forces acting on an object |
| balanced forces | two or more forces exerted on an object when they cancel each other and they do not cause a change in the object's motion |
| unbalanced forces | forces whose effects do not cancel each other and the motion of the object changes |
| Newton's First Law of Motion | an object at rest remains at rest and an object in motion remains in motion unless acted upon by an outside force |
| friction | the force that acts to resist sliding between two touching surfaces |
| acceleration | the change in velocity divided by the time over which the change occurred |
| Newton's Second Law of Motion | an object acted upon by a force will accelerate in the direction of the force |
| weight | the gravitational force between you and Earth |
| center of mass | the point in an object that moves as if all the object's mass were concentrated at that point |
| Newton's Third Law of Motion | for every action, there is an equal and opposite reaction |
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