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Physics · LAWS OF MOTION
हिन्दीThe ratio of rolling friction force \( f_r \) to kinetic sliding friction force \( f_k \) for a rigid circular wheel rolling on a solid surface is approximately of the order of:
Correct answer · Option 4
\( 10^{-2}\text{ to }10^{-3} \)
Explanation
Rolling friction is much smaller than static or sliding friction by 2 to 3 orders of magnitude. Thus, the ratio \( \frac{f_r}{f_k} \approx 10^{-2}\text{ to }10^{-3} \).
