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19 Force & Newton's Laws

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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