Direction of friciton in bicycyle

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The direction of friction for a ball rolling east is indeed towards the east, while for a bicycle not being pedaled, friction acts backward on both wheels. This may seem contradictory, but it highlights the difference between rolling resistance and friction. Rolling resistance opposes the direction of motion, causing the ball to eventually stop. If the ball rolls west, the direction of friction would then be towards the west. Understanding these concepts clarifies the apparent contradictions in motion dynamics.
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I found that direction of friction on ball rolling to east is towards east. And I Know direction of friction in moving bicycle when it is not paddled is backward on both rear and front wheels. Aren't they contradictory??


Plz help me...
 
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Biplov said:
I found that direction of friction on ball rolling to east is towards east.
So why does a ball always stop rolling after a while?
 
What if the ball rolls to the west? What direction is friction then? Are you absolutely certain of your original finding?
 
Biplov said:
I found that direction of friction on ball rolling to east is towards east. And I Know direction of friction in moving bicycle when it is not paddled is backward on both rear and front wheels. Aren't they contradictory??


Plz help me...

You need to be very careful when looking at the arrows on such diagrams. The acid test is always to think what you would expect to happen as a result of your choice about direction. You have to be right about the difference between front and back wheels. :wink:
 

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