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. After a long time, due to corrosion, the contact surface becomes rough wit

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. After a long time, due to corrosion, the contact surface becomes rough with coefficient of friction μ , and then the string is cut. The block remains at rest. The friction force on the block is now:

TestHub · Accepted Answer

With the string cut, static friction must balance the component of gravity along the plane
$f = m g sin θ$
(which must be within the limiting value $μ m g cos θ$ since the block stays at rest).
Option B.

Physics - NLM Question with Solution | TestHub

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