Q.

Which is true for rolling friction (µr), static friction (µs) and kinetic friction (µk) ?

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a

μs>μk>μr

b

μs<μk<μr

c

μs<μk>μr

d

μs>μr>μk

answer is A.

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Detailed Solution

μs>μk>μrThe rolling fiction is always less than sliding friction. Therefore, it is easy to move a heavy load from one place to another by rolling it over the surface instead of sliding it over the same surface.
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Which is true for rolling friction (µr), static friction (µs) and kinetic friction (µk) ?