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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.

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    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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