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  4. A block of mass 1 kg is pulled along the curve path A C B by a tangential force as shown in figure. The work done by the frictional force when the block moves from A to B is

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Q. A block of mass $1\, kg$ is pulled along the curve path $A C B$ by a tangential force as shown in figure. The work done by the frictional force when the block moves from $A$ to $B$ isPhysics Question Image

Work, Energy and Power

Solution:

Work done by friction
$=\int \vec{F} \cdot \overrightarrow{d s}=\int\limits_0^x \mu m g \cos \theta \frac{d x}{\cos \theta}=\mu m g x=20\, J$

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