what is friction ?...
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1.Friction is a force between two surfaces that are sliding, or trying to slide, across each other. ... Friction always works in the direction opposite to the direction in which the object is moving, or trying to move. Friction always slows a moving object down.
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2.Friction is defined as the resistance offered by the surfaces that are in contact when they move past each other. Friction provides traction that is needed to walk without slipping.
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