InterviewSolution
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InterviewSolution
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State the laws of rolling friction . |
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Answer» Solution :When a body is ROLLING over the other , then friction between the bodies is known as rolling friction . Rolling friction COEFFICIENT , `mur=("Rolling friction")/("Normal reaction")=(Fr)/(N.R)` Laws of rolling friction : (1)Rolling friction will develop a point contact between the surface and the rolling sphere. For objects like wheels line of contact will develop. (2)Rolling friction`(f_(r))` has least value for given normal reaction when compared with static friction `(f_(s))` or kinetic friction `(f_(k))`. (3) Rolling friction is directly proportional to normal reaction , `f_(r)propN.` (4) In rolling friction the surfaces in contact will get momentarily deformed a little . (5) Rolling friction depends on area of contact . Due to this reason friction increases when air presure is less in tyres (Flattened typers). (6) Rolling friction is inversely proportional to radius of rolling body `murprop(1)/(r)` |
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