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How to find the minium coefficient of static friction?

by ARJewell
Tags: coefficient, friction, minium, static
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ARJewell
#1
Mar29-10, 10:03 AM
P: 6
1. The problem statement, all variables and given/known data

For a system (with frictionless pulley) Mewsubk = .25 and the system is initially at rest. The mass of block 1 is 16 kg and the mass of block 2 is 12 kg. Determine the minimum coefficient of static friction needed to prevent any movement.

2. Relevant equations

F=ma

3. The attempt at a solution
I have no idea how to figure it out.
I figured out the acceleration to be 2.8m/s^2 because:
a= 12kg*9.8m/s^2 - .25*16kg*9.8m/s^2/(16kg+12kg)
I figured out the tension in the connecting string to be 84 N because:
T=mewsubk*m1g+m1a


Any help on how to figure out minimum coefficient of static friction?
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tiny-tim
#2
Mar29-10, 11:14 AM
Sci Advisor
HW Helper
Thanks
tiny-tim's Avatar
P: 26,148
Hi ARJewell ! Welcome to PF!

(have a mu: and try using the X2 tag just above the Reply box )
Quote Quote by ARJewell View Post
Determine the minimum coefficient of static friction needed to prevent any movement.

F=ma
No, if movement is prevented (or even, in a different question, where the block is just moving), a must be zero!
Try again.


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