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Friction problem

  • Thread starter srh
  • Start date
srh
7
0
1. 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.


2. Homework Equations
us=0.3 (static friction)
uk=0.2 (kinetic friction)


3. 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
1. Homework Statement



2. Homework Equations



3. The Attempt at a Solution
 

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Answers and Replies

Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,598
6
Perhaps if you showed your working, we could show you where you've gone wrong...
 
103
0
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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