Friction problem

  • Thread starter srh
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  • #1
srh
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Homework Statement


I have attached a picture. Determine the friction force acting on the block shown when the angle is 30 degrees and P=200 N.


Homework Equations


us=0.3 (static friction)
uk=0.2 (kinetic friction)


The Attempt at a Solution



I set up a free-body diagram w/the 1kN, P, Normal force and frictional force. I was able to solve for both the Normal force and frictional force. I got 326.79N for friction and 966.025 for Normal. I thought I was incorrect because it doesn't fit into the f<=usN

Homework Statement





Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
Hootenanny
Staff Emeritus
Science Advisor
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Perhaps if you showed your working, we could show you where you've gone wrong...
 
  • #3
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I would draw a better diagram :).

One with acceleration; in which direction is it pointing? Acceleration sets your positives/negatives on the axis on the diagram. The friction; in which way is friction pointing/acting?

After doing such you can do a summination of forces =).
 

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