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# Work Done by Friction on a Ramp

CLMECH-PJHW@X

A block with mass $m$ slides a distance $x$ down a ramp with angle $\theta$. The coefficient of kinetic friction between the block and the ramp is $\mu$.

How much work $W$ is done on the block by friction?

A

$W = -\mu mgx \cos\theta$

B

$W = \mu mgx\cos\theta$

C

$W = \mu mgx\cos^2\theta$

D

$W = -\mu mgx$