19 Force & Newton's Laws
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| velocity | the speed and direction of moving object
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| force | a push or a pull
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| net force | the combination of all the forces acting on an object
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| 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
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| unbalanced forces | forces whose effects do not cancel each other and the motion of the object changes
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| 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
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| friction | the force that acts to resist sliding between two touching surfaces
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| acceleration | the change in velocity divided by the time over which the change occurred
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| Newton's Second Law of Motion | an object acted upon by a force will accelerate in the direction of the force
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| weight | the gravitational force between you and Earth
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| center of mass | the point in an object that moves as if all the object's mass were concentrated at that point
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| Newton's Third Law of Motion | for every action, there is an equal and opposite reaction
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