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    A rock starts from rest and slides down a hill. Find average friction force and mass.

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    SEE ATTACHMENT #1 for a diagram showing parameters.

    A rock starts from rest then slides distance L= 5 m down a concave hill to a point which is h= 3 m below starting point.

    During the slide, Q= 111 joules of heat are generated, and the final speed is V= 4.8 m/sec.

    PART a. Find the average friction force.

    PART b. Find the mass of the rock.

    © BrainMass Inc. brainmass.com March 4, 2021, 5:44 pm ad1c9bdddf
    https://brainmass.com/physics/energy/a-rock-starts-from-rest-and-slides-down-a-hill-find-average-friction-force-and-mass-8269

    Attachments

    Solution Preview

    PART a.
    Step 1.
    The first step in a solution is to make or observe a careful diagram of the event.
    From ATTACHMENT #1, come the following observations:
    A. The friction force depends on the angle of the slope, therefore ...

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