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Inertia due to acceleration

  1. Feb 11, 2009 #1
    I have a counterweight system I am trying to develop. One of my associates and I are in disagreement over something though.

    The system is simple, it is effectivly two 850 Lb weights connected together by a chain. The chain is suspended by two pulleys. One of the pulleys is connected to motor. I am trying to calculate the torque required to move the system 40 inches in 1 second.

    I believe the only forces that I have to overcome is inertia due to acceleration and the system friction. Assuming there is no friction the inertia is all that is l have to overcome.

    Here is my question: Is the inertia load 1700 Lbs or 850. My associate says gravity will remove one of the loads but if gravity acts on both weights shouldnt it cancel out?

    Attached Files:

  2. jcsd
  3. Feb 11, 2009 #2


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    Science Advisor

    You are correct.
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