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A dockworker loading crates on a ship finds that a 19-kg crate, initially at rest on a horizontal surface, requires a 70-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.

  • Physics -

    Take a look at the definitions of the friction coefficients. That should tell you how to do this problem, which is:

    Divide the required forces by the weight. Use 70 N for the static coefficient, and 60 N for the kinetic one.

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