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Direction of friciton in bicycyle

  1. Jul 8, 2013 #1
    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.....
  2. jcsd
  3. Jul 8, 2013 #2


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    So why does a ball always stop rolling after a while?
  4. Jul 8, 2013 #3


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    What if the ball rolls to the west? What direction is friction then? Are you absolutely certain of your original finding?
  5. Jul 8, 2013 #4


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    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:
  6. Jul 8, 2013 #5


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    I assume you mean "rolling resistance" (not friction), which opposes the direction that an object is rolling towards. Wiki article:

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