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  4. A block is released from rest from top of a rough curved track as shown in the figure. It comes to rest at some point on the horizontal part. If its mass is 200 g, calculate the negative of work done (in joules) by friction.

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Q. A block is released from rest from top of a rough curved track as shown in the figure. It comes to rest at some point on the horizontal part. If its mass is $200\, g$, calculate the negative of work done (in joules) by friction.Physics Question Image

Work, Energy and Power

Solution:

$W_{f}+W_{g}=0 $
$\Rightarrow W_{f}=-W_{g}=-m g h $
$=-0.2 \times 10 \times 2 $
$=-4\, J $