A 10 m/s B 20 m/s All surface are rough. Draw the friction force on A & B. If coefficient of kinetic friction between A (mass : 2 kg) and B (mass : 8 kg) is 0.2 and between ground and B is 0.1. Find the time after which the slipping between the blocks stops. Assume the the block A doesn't fall off the block B.
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Block A moves due to friction. Maximum acceleration of A can be fmaxm or μmgmfmaxm or μmgm or μg=0.2×10=2ms−2μg=0.2×10=2ms-2. If both the blocks move together, then combined acceleration of A and B can be 103=3.33ms−2103=3.33ms-2. Since, this is more than the maximum acceleration of A . Slipping between them will take place and force of friction will be maximum of μmAg=2NμmAg=2N.
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