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Help with frictional problems

  • #1
http://img175.imageshack.us/img175/2448/picture1wt8.png [Broken]

I am having trouble deciding when to use the static and kinetic frictions and what to do about this problem. Thanks for any help!
 
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Answers and Replies

  • #2
Doc Al
Mentor
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If the surfaces slip, then you have kinetic friction; if they don't, it's static friction.

Start by figuring out if it's possible for the block to not slip on the slab.
 

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