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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.

    © BrainMass Inc. brainmass.com March 4, 2021, 11:29 pm ad1c9bdddf
    https://brainmass.com/physics/work/work-done-against-friction-427408

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    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.

    $2.49

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