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Math Help - Mechanics/moments problem.

  1. #1
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    Mechanics/moments problem.

    Truly stuck on this question, and not sure where the angle should be situated in the first place?

    'The pedal of a bicycle is 18cm long. When it is pushed downwards by a cyclist it experiences a force of 350N. Calculate the moment when the pedal is horizontal and then when it is 65 degrees below the horizontal.'

    Any help would be greatly appreciated!
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  2. #2
    MHF Contributor ebaines's Avatar
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    Re: Mechanics/moments problem.

    The moment is calculated using the cross product:

     \vec M = \vec F \ \times \ \vec R

    where  \vec F is the force being applied and  \vec R is the vector from the center of the crank to the pedal. For this problem you can calculate the cross product as simply the magnitude of F times the magnitude of R times the sine of the angle between them.
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