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Leverage and Moment of Gravity?

  1. May 7, 2008 #1
    Hello everyone.

    I was reading through quite an old textbook, 1920's, and the book mentions 'leverage' and 'moment of gravity. Specifically: there are two booms OA and OB joined at one end O, making a 'v' shape. The point O is fixed, but the booms can rotate about that point O in the horizontal plane. There is a weight W on OA, and a spring attached to OB and some fixed point above it.

    Now, the author says that if the weight is slightly depressed, the moment of gravity about O hardly changes, but the leverage about O of B is decrease, and a restoring force is brought into play. What does this all mean? I think 'moment of gravity' has something to do with torque, but what on earth does he mean by 'leverage'? Any help is appreciated.
  2. jcsd
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