Homework Help: physics

Posted by monic on Tuesday, October 2, 2012 at 6:03pm.

A dockworker loading crates on a ship finds that a 21-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 51 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.
μstatic
μkinetic

physics - bobpursley, Tuesday, October 2, 2012 at 6:06pm
initial friction=70N=coeff_s*mass*g
solve for coeff_s

sliding friction
friction=51N=coeff_k*mass*g

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