Crate issue

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Article #1679

#1679

From: TGen
Date: Mon, 20 Dec 2004 02:44

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Good evening.

I would appreciate if someone could verify the following please.

The question:

A 100kg crate is pulled across a horizontal floor by a force P that makes an 
angle of 30 degrees above the horizontal. The coefficient of kinetic 
friction between the crate and floor is 0.200. What is P if the net work 
done is zero.
My solution:

First determine Ff = umg. This would give me 196N. My next step is to 
determine P. I use 196N and put that over cos30. My answer is 226.3N. Does 
this seem reasonable.

thanks for your time

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Subject: Crate issue
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