Lift yourself Up
An enjoyable interactive play model explains the mechanical advantage gained through pulley system.We can possibly lift objects weighing more than ourselves. We cannot, however, normally, lift ourselves up. But, the arrangement here allows us to do just that. Sit on the chair provided with the system. Pull the free end of the rope downwards. The chair, along with you, moves up! The situation is similar to drawing water from a well. It is a lot easier to lift the weight when the rope runs over a pulley than when it is directly pulled up. A pulley is a simple machine that allows us to change the direction of application of force thereby reducing our efforts. It becomes increasingly easier to lift as we increase the number of pulleys.
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