Q.

A block of mass M is being pulled along rough horizontal surface. The coefficient of friction between the block & surface is μ. If another block of mass M/2 is placed on the block & it is again pulled on the surface. The coefficients of friction between the block and surface will be

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a

μ

b

3μ/2

c

μ/2

d

2μ

answer is A.

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Detailed Solution

The coefficient does not depend on the normal reaction between the block and the surface. So the coefficient of friction will be μ

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A block of mass M is being pulled along rough horizontal surface. The coefficient of friction between the block & surface is μ. If another block of mass M/2 is placed on the block & it is again pulled on the surface. The coefficients of friction between the block and surface will be