Rope pulling mass w/ friction

  • Thread starter JSmith2009
  • Start date
  • #1

Homework Statement

A rope that is 30° to the horizontal has a tension of 150 N. It is used to pull a 40kg packing crate on a rough sruface through a distance of 6 m. If the crate moves at a constant speed, find the work done by friction.



Homework Equations



Energy formulas, not kinematic.


The Attempt at a Solution



I'm at a loss for what step to take after drawing my F-B-D. I've got it set up, but just brain-farting what next. I've thought over this problem, and I know it's a very simple one, but I just can't comprehend it or something.
 

Answers and Replies

  • #2
108
0
"constant speed" is question-code for something...
 

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