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

A girl pushes a shovel at uniform velocity across a sidewalk.

The handle of the shovel is inclined at 55degrees to the horizontal

and the girl pushes the handle with a force of 100N.

What is the friction and what is the coefficient of kinetic friction.

Given Information from said Question:

For both the girl and the shovel

a= 0m/s^{2};uniform velocity

F_{appx}= 100cos55

F_{appy}= 100sin55

Not Given Information:

Mass, therefore gravity nor normal force can be calculated. But we don't need either as far as I know.

2. Relevant equations

F_{k}=F_{appx}(in this instance, because F_{netx}is equal to 0 due to acceleration)

I don't know an equation for the coefficient of kinetic friction..

3. The attempt at a solution

I solved for force of friction; that was an easy one.

F_{k}=100cos55

F_{k}=57.36N[<--] (the direction is from my FBD assuming --> is positive)

I've never heard of "the coefficient of kinetic friction", and we definatly did not learn it in class. A quick use of google didn't give me the exact answer I needed. I then turned to wikipedia (as i love it and it's never let me down), which then told me "The coefficient of friction is an empirical measurement – it has to be measured experimentally, and cannot be found through calculations."

Since i don't exist where this question takes place, and don't have her shovel or what it's made of I can't do this experimentally. So if I can't calculate it, and I can't measure it myself, how exactly do i find the coefficient of kinetic energy.What does the coefficient of kinetic energy actually mean?

Much thanks ^^

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# Coefficient of Kinetic Energy; What is it and How can I calculate it?

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