Physics

A 20 kg table initially at rest on a horizontal floor requires a 136 N horizontal force to set it in motion. Once the table is in motion, a 71 N horizontal force keeps it moving at a constant velocity. What is the coefficient of kinetic friction between the table and floor?

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  1. Wt = mg = 20 kg * 9.8 N/kg = 196 N. =
    Weight of table.

    Ft = 196 N. @ 0 Deg. = Force of table.
    Fp = 196*sin(0) = 0 = Force parallel to floor.
    Fv = 196*cos(0) = 196 N. = Force perpendicular to the floor.

    Fn = Fap-Fp-Fk = ma = 0, a = 0.
    71-0-Fk = 0,
    Fk = 71 N. = Force of kinetic friction.

    u*Fv = 71,
    196u = 71,
    u = 0.362 = Kinetic coefficient of friction.

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