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    PhysicsMan44's Avatar
    PhysicsMan44 Posts: 1, Reputation: 1
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    #1

    Nov 11, 2010, 11:32 AM
    Energy and Coefficent of Friction needed
    A daredevil slides downa ride and the angle he slides is 30ΒΊ making a 200 meter elevation changes.. Daredevils mass is 60kg. If final velocity is 30m/show much energy was lost due to friction? What is friction force acting during slide and what is the coefficent of friction?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Nov 12, 2010, 11:10 PM

    Is the daredevil at rest at the top?

    Use the principle of conservation of energy for this.

    Potential Energy at top = Kinectic Energy at bottom + Work done due to friction.

    Form this, use W = Fd

    Find F, the force of friction.

    To find the coefficient of friction, use F = μR

    R is the normal component of the daredevil and F is the force you found previously.
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