Can Friction Force Cause a Rigid Body to Move Uphill?

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SUMMARY

The discussion centers on the mechanics of friction forces acting on rigid bodies on inclined planes. Key points include the clarification of option A, which should state that a rotating ball on a rough inclined plane may remain at rest until it stops rotating. The participants confirm that friction can indeed act upwards on a rigid body rolling up an incline, countering gravitational forces. The conversation also explores the conditions under which a sphere can move uphill if friction exceeds the gravitational component acting down the slope.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Familiarity with friction forces and their directionality
  • Knowledge of rigid body dynamics
  • Basic principles of inclined planes in physics
NEXT STEPS
  • Research the role of static and kinetic friction in rolling motion
  • Study the effects of incline angles on friction and motion
  • Explore the concept of torque and its relation to rolling bodies
  • Investigate real-world applications of friction in vehicles on inclines
USEFUL FOR

Physics students, educators, and anyone interested in understanding the dynamics of motion on inclined planes and the role of friction in mechanical systems.

Sumanth
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Which of the following statements are true??

OPTIONS:

A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it is rotating.

B)A rigid body rolls up an inclined plane without sliding. The friction force on it will be upwards.

C)A rigid body rolls down an inclined plane without sliding. The friction force on it will be upwards.

D)A rigid body is left from rest and having no angular velocity from the top of a rough inclined plane. It moves down the plane with slipping. The friction force on it will be upwards...
 
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Neat - how are you thinking about these different options?
 
I thought that the first option was wrong as while rotating,,,,... when kept on rough surface due to frictional force it leads to translation
 
Very good - keep going.
Don't be afraid to post possible answers that are wrong - we've all been there.
It's just that I cannot tell how to advise you unless I see how you are thinking.
 
I think there is a typo in part A. right now it says
"A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it is rotating."
That doesn't seem to make sense. I think is should say
" A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it stops rotating."
in which case I think it's true.
 
Ok then how can u support ur statement ? Reason?
 
Reason?

dauto said:
I think there is a typo in part A. right now it says
"A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it is rotating."
That doesn't seem to make sense. I think is should say
" A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it stops rotating."
in which case I think it's true.


Ok then how can u support your statement? Reason for being at rest?
 
Sumanth said:
A)a rotating ball is kept on a rough inclined plane.It may remain at rest till it is rotating.
I don't understand what is meant by "is kept". Can you rephrase this option?
 
Doc Al said:
I don't understand what is meant by "is kept". Can you rephrase this option?

"Is kept". Means. "Is placed"
 
  • #10
The friction force uphill might just be enough to cancel the gravity's downhill component might it not? And if it does, won't it remain at rest until it stops spinning?
 
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  • #11
dauto said:
The friction force uphill might just be enough to cancel the gravity's downhill component might it not? And if it does, won't it remain at rest until it stops spinning?

Ohh! I got it.. Thank you
 
  • #12
Then is the fourth option correct? If so why?
 
  • #13
Sumanth said:
Then is the fourth option correct? If so why?
What do you think and why?
 
  • #14
dauto said:
The friction force uphill might just be enough to cancel the gravity's downhill component might it not? And if it does, won't it remain at rest until it stops spinning?

You are right .

But I would like to know is it possible for the sphere to move uphill if friction exceeds the component of gravity ?
 
  • #15
But I would like to know is it possible for the sphere to move uphill if friction exceeds the component of gravity ?
Why not try it - get a wheel and see if you can make it roll uphill.
Or just look and see if cars can drive up hills?
 

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