- #1
Jack.525
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Homework Statement
There is a string that is attached to a bar as shown below in the picture. What is the coefficient friction between the bar and floor before bar starts slipping.
Reference https://www.physicsforums.com/threa...t-of-friction-using-torque-and-forces.723351/[/B]
Homework Equations
Moment which is
moment (torque) = F r (position)
The Attempt at a Solution
I have chosen a pivot point about the point where the bar contacts with the ground.
The equation for the torque about the point where bar contacts with the ground ->
- mg *1.4863 - T*1.814989 = 0
I found 1.814989 by using the cross product.
Then
Fx = 0
-Tsin21 - f(friction) = 0
-Tsin21 - u(coefficient of friction) *N = 0
Fy = 0
-mg + N + T*cos21 = 0
Now, I'm stuck and i don't how to proceed further. Also, I'm confused about this part ->
So the formula for friction is f = u*N, is N equals to mg ?