write down two properries of frictional force
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1. Frictional force always acts parallel to two planes in contact with each other and in a direction opposite to that of relative motion of the two bodies. 2. ... Frictional force always decreases the relative motion between two bodies or surface.
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1. frictional force always acts parallel to two planes in contact with each other and in a direction opposite to that relative motion of the two bodies. 2. frictional force always decrease the relative motion between two bodies or surface.
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