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PULLEYS AND LIFTING - 1 | |
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Pulley systems can be used to lift weights safely and
effectively. The diagram below shows a pulley attached to a beam. The
rope is ‘pulled’ on the effort side and the weight being lifted is on
the right hand side, called the ‘load’. |
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The diagrams below show how a pulley can be compared to a lever. First draw a fulcrum in the centre of the pulley wheel. Then draw a beam across the centre, balancing on the fulcrum. The comparison with a lever can now be seen clearly. Pulleys are a type of lever. |
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MECHANICAL ADVANTAGE |
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Mechanical advantage is defined as the ratio of load to effort. Pulley systems rely on this important relationship between load and effort. |
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Pulleys like levers rely on mechanical advantage. The higher the mechanical advantage, the easier it is to lift a weight. In the example the LOAD and the EFFORT is equal and consequently there is no mechanical advantage with this single pulley. |
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