• Support PF! Buy your school textbooks, materials and every day products Here!

How to find the minium coefficient of static friction?

  • Thread starter ARJewell
  • Start date
  • #1
6
0

Homework Statement



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.

Homework Equations



F=ma

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?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
25,832
250
Welcome to PF!

Hi ARJewell ! Welcome to PF! :smile:

(have a mu: µ and try using the X2 tag just above the Reply box :wink:)
… 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! :wink:

Try again. :smile:
 

Related Threads on How to find the minium coefficient of static friction?

Replies
2
Views
581
Replies
3
Views
10K
Replies
16
Views
5K
Replies
5
Views
2K
Replies
2
Views
735
Replies
13
Views
2K
Replies
1
Views
8K
Replies
6
Views
11K
  • Last Post
Replies
4
Views
1K
  • Last Post
2
Replies
30
Views
3K
Top