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    The problem statement, all variables and given/known data
    Hi
    I am not sure about this question. Can anyone help?

    It states this way:
    A wheel of radius 0.5m rests on a level at a point C and makes contact with the edge E of a kerb of height 0.2m. A horizontal force of 240N, applied through the axle of the wheel at X, is required just to move the wheel over the kerb. Show that the weight of the wheel is 180N.





    2. Relevant equations
    Moment = Perpendicular force x distance



    3. The attempt at a solution
    I was thinking of taking moments but not even sure how to begin.
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      (Original post by aurao2003)
      The problem statement, all variables and given/known data
      Hi
      I am not sure about this question. Can anyone help?

      It states this way:
      A wheel of radius 0.5m rests on a level at a point C and makes contact with the edge E of a kerb of height 0.2m. A horizontal force of 240N, applied through the axle of the wheel at X, is required just to move the wheel over the kerb. Show that the weight of the wheel is 180N.

      2. Relevant equations
      Moment = Perpendicular force x distance

      3. The attempt at a solution
      I was thinking of taking moments but not even sure how to begin.
      Yes, take moments about the point E.
      For the sphere to just lift, the clockwise moments = anticlockwise moments.
      Here's a diagram to help.
      You need to work out the perpendicular distances EA and EB
      It's just a bit of geometry and pythagoras.
      I've probably given you too much help with this one!

     
     
     
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