Homework Help: physics

Posted by Malcolm on Thursday, September 30, 2010 at 11:04pm.

A dockworker loading crates on a ship finds that a 24 kg crate, initially at rest on a horizontal surface, requires a 79 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 57 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.

physics - MathMate, Friday, October 1, 2010 at 7:24am
The initial force it takes to move the crate is given by μs*mg
where μs is the coefficient of static friction.
Similarly, the coefficient of kinetic friction can be calculated from the force it takes to maintain motion.

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