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A pulley is a wheel with a groove along its circumference (Figure 6.6). A string or rope passes through the groove. The pulley rotates about an axle on which it is mounted. The axle is fixed to a frame or a block.
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Figure 6.6
In a simple pulley system, the mechanical advantage is equal to 1.
The direction of effort is opposed to the load. This is for the sake of convenience of applying the effort of drawing water from a well.

An ideal pulley is frictionless and massless.

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