# physics

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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 -

initial friction=70N=coeffs*mass*g
solve for coeffs

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

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