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1. The act of rubbing the surface of an object against that of another; especially rubbing the limbs of the body to aid the circulation. 2. The force required for relative motion of two bodies that are in contact. [L. frictio, fr. frico, to rub]
dynamic f. the force that must be overcome to maintain steady motion of one body relative to another because they remain in contact. Cf. starting f.
starting f. the force that must be overcome to initiate the motion of one body relative to another because they have been resting in contact. Cf. dynamic f. static f;
static f. starting f
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