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A horizontal force, F1 = 85 N, and a force, F2 = 18.4 N acting at an angle of θ to the horizontal, are applied to a block of mass m = 2.1 kg. The coefficient of kinetic friction between the block and the surface is μk = 0.2. The block is moving to the right.

A. Solve numerically for the magnitude of the normal force, FN in Newtons, that acts on the block if θ = 30°.

B. Solve numerically for the magnitude of acceleration of the block, a in m/s2, if θ = 30°.

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Harry

  1. assuming the force is acting downward?

    frictionforce=forcenormal*mu
    = (F1*g + F2*sinTheta)mu

    acceleration
    net force=ma
    F2cosTheta-forcefriction=ma
    solve for a.

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    bobpursley

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