Rolling Down Ramp - Question on Friction

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    Friction Ramp Rolling
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SUMMARY

The discussion centers on the mechanics of a cylinder rolling down a ramp while experiencing friction and tension from a rope. It is established that the direction of friction acts up the ramp, which is essential for understanding the torque necessary for the cylinder's motion. The confusion arises from reconciling the upward frictional force with the downward motion of the cylinder. The key takeaway is that friction is required to prevent slipping and facilitate rolling, ensuring the cylinder maintains its rotational motion as it descends.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with torque and rotational dynamics
  • Knowledge of frictional forces and their directionality
  • Basic principles of rolling motion without slipping
NEXT STEPS
  • Study the concept of torque in rotational dynamics
  • Learn about the role of friction in rolling motion
  • Explore the equations of motion for rolling objects
  • Investigate the effects of tension in systems involving pulleys and ropes
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This discussion is beneficial for physics students, mechanical engineers, and anyone interested in understanding the dynamics of rolling motion and friction in mechanical systems.

TORQ12
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You have a cylinder rolling down a ramp, without slipping. There is a rope wrapped around it (pulling up) with tension T.

The direction of friction is always up the ramp. How do I picture this? From the math, I know that it must be true. But I cannot really imagine it.
 
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Well you know the cylinder rolls down the ramp. What kind of torque would be necessary for the cylinder to roll the correct way? If that was provided by a force at the place of contact between the cylinder and the ramp, where would that force point?
 
You say that I know the cylinder rolls down the ramp. That is not necessarily true--I understand that case (I think). But friction also points up the ramp if the cylinder rolls down it. It's the fact that it's up in both cases that confuses me.
 

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