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Math Help - Mechanics problem!

  1. #1
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    Mechanics problem!

    Hello! i have an applied mechanics proble. dont know how to start off.. or do any other bit for that matter. can somebody share some help? =)


    The figure represents the slow flexion and extension movements of the leg and thigh. the length of the leg is L=0,4m, and the weight of the leg is m=4.8Kg, and the thigh m=9,8Kg. We´re also given the distances to the center of mass of the thigh (B) and leg (D) from the extremities. ( AB= CD= 0.43L ).
    Determine the force F in function to angle alfa, and the strength of the joint connections of the hip(A), the knee(C) and the ankle(E).
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  2. #2
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    Each of the leg segments is pulled by gravity downwards. Because of the angle of the legs, there is a net force in the direction opposite to F.

    The weights let you figure out mg, the dimensions let you figure out the angles.

    I don't know what is meant by "strength of joint connection".
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  3. #3
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    "strength of joint connection" i suppose is equivalent the force apllied at each
    point...? yep, but how do i calculate the net force?
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  4. #4
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    Hi

    Resolve the forces verticly and horizontally then take moments about one of the points (or two for the points) and the equations will drop out.
    Last edited by Bwts; January 21st 2010 at 09:08 AM.
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