Finding F on a box on an inclined plane

  • Thread starter mistabry
  • Start date
  • #1
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Homework Statement



A block weighing 87.5 N rests on a plane inclined at 25.0o to the horizontal. A force is applied to the object at 50.0o to the horizontal, pushing it upward on the plane. The coefficients of static and kinetic friction between the block and the plane are, respectively, 0.335 and 0.156.
(a) What is the minimum value of F that will prevent the block from slipping down the plane?
(b) What is the minimum value of F that will start the block moving up the plane?
(c) Once moving, what value of F will move the block up the plane with constant velocity?


Homework Equations


fs<= μs|N|
fk= μk|N|

The Attempt at a Solution


I attempted the problem by drawing out a free body diagram of what is occuring, but I was unable to continue after that because everything got all confusing! Help D;!
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
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hi mistabry! :wink:

I attempted the problem by drawing out a free body diagram of what is occuring, but I was unable to continue after that because everything got all confusing! Help D;!
the fbd has only four forces …

what are your x and y equations? :smile:
 
  • #3
You have to do it using FBD. Though confusing, you have to post it. We will take after that.
 

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