> > A first class lever has the fulcrum between the load and the force. A second class has the load between the fulcrum and force (like a wheel barrow). A third class lever has the force between the fulcrum and the load (like a grand hammer shank.) A second class lever always optimizes force, a third class optimizes speed. A first class lever can optimize either depending on the length of the arms. > David M. Porritt Good explaination. Not to change the subject too much, but do you know how they explain the necessity of using acceleration of gravity in string tension formulas? I have an idea but no physics book to check it against. ---ric
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