A metal block of mass m is placed on a smooth metallic plane inclined at θ , in support with a string as shown in the figure. If, after long time due to corrosion, the contact surface becomes rough wi

Question

A metal block of mass m is placed on a smooth metallic plane inclined at θ , in support with a string as shown in the figure. If, after long time due to corrosion, the contact surface becomes rough with coefficient of friction μ , then the friction force acting on the block will be:

TestHub · Accepted Answer

The string already balances the pull of gravity along the plane
$T = m g sin θ$
so no tendency of relative sliding remains and the static friction stays zero even after the surface becomes rough.
Hence none of the given values.
Option D.

Physics - NLM Question with Solution | TestHub

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