| 释义 |
friction (frictional force) For two bodies in contact, say the frictional force and the normal reaction have magnitudes F and N respectively (see contact force). The coefficient of static friction μs is the ratio F/N in the limiting case when the bodies are just about to move relative to each other. Thus if the bodies are at rest relative to each other, F ≤ μsN. The coefficient of kinetic friction μk is the ratio F/N when the bodies are sliding, in contact with each other. These coefficients of friction depend on the materials of which the bodies are made. Normally, μk is somewhat less than μs. See also angle of friction.
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