Can Friction Force Cause a Rigid Body to Move Uphill?

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Homework Help Overview

The discussion revolves around the effects of friction on a rigid body moving on an inclined plane, specifically whether friction can cause a body to move uphill. Participants are examining various statements related to the behavior of a rotating ball and rigid bodies on inclined surfaces.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are analyzing different statements about friction and motion on inclined planes, questioning the validity of each option. There are discussions about the implications of frictional forces and gravity's components, as well as the interpretation of the wording in the options provided.

Discussion Status

There is an active exploration of the statements, with participants seeking clarification and reasoning behind their interpretations. Some have expressed uncertainty about specific phrases and are prompting others to provide justifications for their views. The conversation is ongoing, with multiple interpretations being considered.

Contextual Notes

Participants are addressing potential typos and ambiguities in the statements, which may affect their understanding and responses. There is a focus on the conditions under which friction can influence motion, particularly in relation to gravity.

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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