Question

explain about pulley ​

Answer 1

Answer:

a pulley is an object which take up heavy object by hook

Answer 2

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explain about pulley

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Pulley:-

It is a simple wooden or metallic machine that uses a wheel and rope to lift heavy loads. Nowadays, plastic pulleys are also available in the market to carry small loads.

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Types of Pulley:-

• Fixed Pulley

When the block of the pulley is fixed on a high platform, it is known as fixed. An extensible string passes over the groove where its one end is attached to the body to be lifted while the other end is free.

• Movable Pulley

When the block of the pulley is not fixed but carries the load, it is known as Movable. An inextensible string is tied around the groove where its one end is fixed to fixed support while the other end is kept free to apply the effort. As the effort is applied, the block together with the load moves upward.

Formula for Pulley:-

Following are the formulas that are used when pulleys are used for lifting. There are formulas that are important and they are:

• Mechanical advantage formula: It is defined as the ratio of load to the effort.i.e. M.A=Load/Effort
• Velocity ration of pulley is number of pulley.

Example of Pulley are:-

• Elevators use multiple pulleys in order to function.
• A cargo lift system that allows for items to be hoisted to higher floors is a pulley system.
• Wells use the pulley system to hoist the bucket out of the well.
• Many types of exercise equipment use pulleys in order to function.

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