(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 15.0 kg block is dragged over a rough, horizontal surface by a 74.9 N force acting at 17.6 degrees above the horizontal. The block is displaced 4.91 m, and the coefficient of kinetic friction is 0.266.

Find the work done by the 74.9 N force = 351 J

Find the work done by the normal force = 0 J

What work does the gravitational force do on the block? = 0 J

This is the part i can't figure out:

How much energy is lost due to friction?

And related to that:

Find the total change in the block's kinetic energy.

2. Relevant equations

Ff = ((mu)k)(mg)

E = F*d

3. The attempt at a solution

Ef = ((mu)k)(mg) (d)

= 0.266*15*9.8*4.91

= 192 J

What am I doing wrong?

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# Energy loss due to friction

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