Wheel torque > contact patch friction > torque

Thread starter WildEnergy
Start date Jul 24, 2010
Tags

Contact Friction Torque Wheel

AI Thread Summary

When torque is applied to a wheel, the friction at the contact patch resists this force, creating an equal and opposite torque around the contact patch. This relationship holds true in a static case or under small forces with slow movement, assuming moment of inertia is neglected. The discussion emphasizes the importance of understanding how torque and friction interact at the contact patch. This interaction is crucial for analyzing wheel dynamics in various scenarios. Overall, the mechanics of torque and friction play a significant role in wheel performance.

Jul 24, 2010

WildEnergy

Am I correct in saying that when a torque is applied to a wheel
the force is resisted by the friction at the contact patch
and then becomes a "equal and opposite" torque acting around
the contact patch?

Physics news on Phys.org

Jul 24, 2010

AJ Bentley

If you neglect moment of inertia. (static case or small force, slow movement)

Thread '1:1 versus 2:1 Mechanical Advantage debate'

The rope is tied into the person (the load of 200 pounds) and the rope goes up from the person to a fixed pulley and back down to his hands. He hauls the rope to suspend himself in the air. What is the mechanical advantage of the system? The person will indeed only have to lift half of his body weight (roughly 100 pounds) because he now lessened the load by that same amount. This APPEARS to be a 2:1 because he can hold himself with half the force, but my question is: is that mechanical...

View full post »

Thread 'Newton's first law?'

Some physics textbook writer told me that Newton's first law applies only on bodies that feel no interactions at all. He said that if a body is on rest or moves in constant velocity, there is no external force acting on it. But I have heard another form of the law that says the net force acting on a body must be zero. This means there is interactions involved after all. So which one is correct?

View full post »

Thread 'Beam on an inclined plane'

Hello! I have a question regarding a beam on an inclined plane. I was considering a beam resting on two supports attached to an inclined plane. I was almost sure that the lower support must be more loaded. My imagination about this problem is shown in the picture below. Here is how I wrote the condition of equilibrium forces: $$ \begin{cases} F_{g\parallel}=F_{t1}+F_{t2}, \\ F_{g\perp}=F_{r1}+F_{r2} \end{cases}. $$ On the other hand...

View full post »