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# the work done against friction

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Starting from rest at a height equal to the radius of the circular track, a block of mass 30 kg slides down a quarter circular track under the influence of gravity with friction present (of coefficient mu). The radius of the track is 35 m.
The acceleration of gravity is 9.8 m/s^2.

If the kinetic energy of the block at the bottom of the track is 4800 J, what is the work done against friction? Answer in units of J.

https://brainmass.com/physics/work/work-done-against-friction-427408

#### Solution Preview

At the top of the track before sliding:
The potential energy of the block: PE = mgr (using the bottom of the track as the reference).
The kinetic energy of the block KE = 0.
So the total energy of the ...

#### Solution Summary

It finds the work done against friction when the block slides down a quarter circular track. The solution is detailed and well presented.

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