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Forces and Laws of Motion

  • Thread starter kaspis245
  • Start date
  • #1
186
1

Homework Statement


A 225 kg crate rests on a surface that is inclined above the horizontal at an angle of 20o.
A horizontal force (F = 535 N parallel to the ground, not the incline) is required to start the crate moving down the incline. What is the coefficient of friction between the crate and the incline?

P.S. Ftr is a frictional force.

image.jpg


Homework Equations


Newton's laws of motion.

The Attempt at a Solution


image.jpg

image.jpg


It doesn't work.
The answer must be 0.665 .[/B]
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
2019 Award
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Funny. That's exactly what I get. What is ##\cos\alpha## on your calculator ?
 
  • #3
186
1
I missed one number xD. Sorry for wasting your time.
 

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