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5 November, 21:16

A 10 lb block with an applied force P = 2 lb is in equilibrium. What is the magnitude of the friction force between the block and the surface? The coefficient of static friction is 0.3 between the block and the surface.

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  1. 5 November, 21:41
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    Weight of block = mg

    = 10 x 32 = 320 poundal.

    frictional force (maximum)

    = coefficient of friction x weight of block

    =.3 x 320

    = 96 poundal.

    Applied force = 2 x 32 poundal

    = 64 poundal.

    Since applied force is less than max frictionl force possible, so

    the block must not be moving.

    magnitude of frictional force = applied force

    = 64 poundal.
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