Experimentally Determine Coefficient of Static Friction

  • #1
I need to determine the coefficient of static friction for the following set-up.

M1 = 380.45g
M2 = 74.7g

This is what I know... u=F/mg

What I can't figure out is how to factor in the horizontal and vertical weights.

Can anyone help?

Thanks!
 

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Answers and Replies

  • #2
I should clarify.. those weights are the weights where the system just begins to move.
 
  • #3
Doc Al
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Hint: What does the tension in the string equal?
 
  • #4
OK, the tension for both is the same.. and it is equal to.... M2g I think ?

I'll keep thinking on this..

Thanks
 
  • #5
Doc Al
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Right. There's a single tension in the string and it equals [itex]M_2g[/itex].

So, what must the friction force equal?
 
  • #6
OK, here's what I think... the force must equal the tension (M2g), which is equal to uN.

What is N then? The mass of M1??
 
  • #7
Doc Al
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OK, here's what I think... the force must equal the tension (M2g), which is equal to uN.
Good!

What is N then? The mass of M1??
Not the mass but the weight of M1.
 
  • #8
Yes, the weight!

Thanks a bunch for your help!
 

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