Friction Flashcards
1
Q
What is the equation of friction?
A
Friction = Frictional Coefficient * Normal Force
2
Q
What direction does friction act?
A
Opposite to the direction of motion
3
Q
What is the friction over a small area of a collar and bearing surface sliding over each other?
A
dF = Friction Coefficient * Change in Normal Force
dF = Mew * p * r * dr * d(theta)
4
Q
How do you calculate the complement of the helix angle for a screw? (alpha)
A
tan alpha = pitch / (2pi * median radias of the thread)
5
Q
What is the equation for an external moment acting on a power screw?
A
M = Weight * Median Radius * (sin alpha + mew cos alpha) / (cos alpha - mew sin alpha)
6
Q
What is T2 of a belt on a two pulley system?
A
T2 = T1 * e ^ (Mew * Beta)
Beta is the angle where the belt is in contact with the pulley
