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Bicycle Torque problem

  1. Nov 7, 2005 #1
    The figure shows a bicycle wheel resting against a small step whose height is h = 0.110 m. The weight and radius of the wheel are W = 29.0 N and r = 0.350 m. A horizontal force F is applied to the axle of the wheel. As the magnitude of F increases, there comes a time when the wheel just begins to rise up and loses contact with the ground. What is the magnitude of the force when this happens?

    I drew a diagram, yet i'm not even sure how to start this problem... help please! thanks!
  2. jcsd
  3. Nov 7, 2005 #2

    Andrew Mason

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    The step provides an axis (a line about which the wheel rotates) which divides the wheel into two parts. You have to determine how that axis divides the mass of the wheel. Then is a matter of determining the centre of mass of each part of the wheel to find the torques.

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