(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Joe puts 11400 J of energy to drag crate 25 m across floor with constant speed. Rope makes 48 degree angle with horizontal.

Force exerted by the rope on the crate?

What is the force of friction acting on the crate to impede its motion?

What work is done by the floor through the force of friction between floor and the crate?

2. Relevant equations

See #3.

3. The attempt at a solution

a. I thought I would need to calculate the horizontal component with the 25 m and 48 degree angle and the cosine function, but got the wrong answer.

b. Ffriction=coefficient of kinetic frictionmg. But I don't know mass, so I'm not sure what equation I'd use.

c. W=Fd...Need to correctly calculate part b.

I'd appreciate any help. I'm not so good at physics, so it'd help if you really explain.

Thanks.

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# Homework Help: Forces problem.

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