What is a Pulley , Its Types , Formula and What is It Used For?

Posted on May 6th, 2021
What is a Pulley
What is a Pulley

What is a Pulley , Its Types , Formula , and What is It Used For?

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What is a pulley?

A Pulley is a wheel that carries a flexible rope, cord, cable, chain, or belt to its edge. Dots are used alone or in combination to transfer energy and movement. The spots on the waist are called bundles. In the belt drive, the points are attached to the shaft on its axis, and power is transmitted between the shafts through an infinite belt running at the points.

Pulley is a mechanical device that helps lift heavy objects more easily. The dots have a wheel that rotates on an axle – a rod that moves from the center of the wheel through a rope, cable, or chain. There are three main types of spots: fixed, moving and compound.

The wheel and axle of a fixed point stand in one place and the best example of a fixed point is a flag pole: when you pull down from the rope, the direction of the force redirects you through the point and you lift the flag up.


How many types of pulley?

types of pulley
How many types of pulley

A cup consists of a rope and a hub or “drum” with a wheel attached to an axle. Spot has a wide range of applications in many situations and can be used to facilitate a variety of moving and lifting tasks. There are three basic types of dots, one that changes the direction of force, one that changes magnitude, and one that changes magnitude and direction.


Fixed Pulley

A fixed pulley, in which the drum is secured at one place. The force required to lift or move an object is not different from that which you lift by hand, but the fixed point allows you to change the direction of the force required. For example, when attached to a bucket that draws water from a well, a fixed bridge allows you to pull the bucket to lift the bucket more efficiently than a bucket that is upstream from the water. gives. The bucket’s water still feels the same weight but is more comfortable to lift.


Movable Pulley

The moving point is where the drum rotates you when it is loaded. There is no change in the direction of the force you apply, but the load will feel lighter than that. If you draw a heavy moat above a barn, for example, a moving point will reduce the load, although the direction you pull will be the same.


Compound System

In a joint point system, there is a moving point and a fixed point. This means not only is the load lighter, you can also change the direction of the force. While this type of configuration makes waiting a lot easier, the tradeoff is that it requires more movement to work.


Complex pulley system

Spots can be multiplied either way to accomplish a wide variety of tasks. For example, a block and tack is a dot configuration consisting of two or more individual drums, each with two or more wheels that rotate on the same axis. The rope is rotated back and forth between the spout drums, weaving through the individual wheels inside those drums. These configurations can be learned in great detail, sometimes seen on larger ships, and sailors may be required to control larger ships from stronger boats.

Such complex point systems can carry a lot of weight if they are anchored too tightly. But when the magnitude of the required force is greatly reduced, the intensity of that reduced magnitude (the amount of rope required to complete the work) increases greatly.


Block and tackle

Block and tackle is a special compound point that can dramatically reduce the work required to move a heavy object. A block and tackle point system consists of several moving points arranged parallel to each other; Fixed dots are deployed with moveable fixed and moveable dots. Each joint pair is associated with the next pair, and each set minimizes the work required. The dot system was popularized by the ancient inventor and mathematician Archimedes.



The cone dot is another specialized dot system that incorporates the basic mechanics of a dot system while allowing mechanical adjustments. The cone dot is a set of multiple dot wheels with low circumference stacked on top of each other at multiple points. This cone shape allows the dot operator to change the speed of dot movements when less work is required for shorter movements and less work is required. Multi-gear bicycles mainly operate on a single system; The cyclist can easily switch between smaller gears that move the bike to lower and higher gears that require more effort, but with each revolution, the bike can go greater distances.


What is the formula of the pulley?

Newton’s second law assumes that F (force) = M (mass) x A (acceleration) There is no friction in the cup and you ignore the mass of the point. Newton’s third law states that each action has an equal and opposite reaction, making the total power of the F system equal to the force on the rope or T (force) + G (force of gravity). In the base point system, if you apply more force than mass, your mass will accelerate and become F-negative. If the mass decreases, then F is positive.

Calculate the tension in the rope using the following equation: t = m x a. Example four, if you try to find T in the base point system, the enclosed mass of 9 g increases to 2 m / s². / s / = 18gm / s² or 18N (Newton).

Calculate the force exerted by gravity on the base point system using the following equation: G = M x n (gravitational acceleration). Gravitational acceleration is 9.8 m / s. The mass is M = 9g, so G = 9g x 9.8 m / s 88 = 88.2gm / s.2, or 88.2 Newton’s.


Add the calculated stress and gravity to your current equation: -F = T + G = 18N + 88.2N = 106.2N. The force is negative because the object moves upward in the point system. F = -106.2N moving from the force to the negative solution.


What is the use of pulley?

The original primary use of the pulley was to make it easier to lift heavy objects. A spot is a simple machine made of a wheel, rope, string, or chain.

In addition to lifting things, dots can be used alone or with multiple dots to carry people or objects. They can also be used to supply power from one shaft to another.

Examples of pulleys include:

a)  Elevators use multiple points to operate.

b) A point system is a cargo lift system that allows objects to be lifted to a higher level.

c) The wells use a dot system to lift the bucket from the well.

d) Spots are used to operate a wide variety of exercise equipment.

e) Construction points are used to lift and hold heavy objects.

f) In a theater, the curtains move with moving mechanisms that separate the curtains.

g) The blinds in the windows move up and down the blinds using a point system. You hide and disguise the cord, opening and closing the bridge system.

h) Uses flagpoles to raise or lower the flag. You drag the string on the dot pole, up or down the flag pole.

i) A clothesline dot system can be used so that the fabric can be pulled towards the user.

j) Spots can be used to place birds and animals on trees or poles and then pull when necessary to replenish or remove them.

k) Ceiling dots can be used to lift all the ceilings of the roof.

l) Cranes are a type of point used in construction.

m) Engines use a dot system to run.

n) Chained fans use a dot system to switch it on and off.

o) The bulldozer is an example of the use of a dot system.

p) Spots are often used on oil derivatives.

q) Spots can be used to extend the ladder.

r) Ships are picked up on the ship and landed with dots.

s) Garage doors are raised and lowered using a dot system.

t) Rock climbers help use spot climbing.

u) Examples of timing belt spots in cars.

v) Dot systems are used to operate escalators.

In all of these examples, a cable system works to make lifting or moving objects easier. Spots are essential for moving and lifting heavy or large objects. The simple principle behind Spot makes him one of the most effective tools available today.


What are the advantages and disadvantages of the pulley?

advantages and disadvantages of the pulley
advantages and disadvantages of the pulley


The main advantage of using digits is that the weight is less effort than normal lifting. In other words, it reduces the amount of actual force required to lift heavy objects. It also changes the direction of the applied force. Both these advantages of utility spots make it an important tool for heavy lifting. It also provides an automatic advantage.

Another advantage of using points is the distance between the operator and the weight. There is a safe distance between them, which prevents any disaster. Spots are easy to assemble and inexpensive. The combination of different directional points can change the position of the load with little effort. Dot systems have moving parts but require little or no lubrication after installation.


In addition to the above benefits when using point systems, there are several disadvantages to using them. The main drawback of using a point system is that it requires too much space to install and operate. The mechanical advantage of the spot will go to higher values, but more space will be required to install them.

In some cases, ropes/belts are carried over the wheel without wire, making it possible for ropes/belts to fall from the wheel. If the system is installed for long-term use, the wheels and cables/ropes may need to be inspected regularly for repairs, cords, and cables as they can cause friction. Frequent use of the system weakens the cords. When using a system the rope can break which damages the operator, the surrounding location, and elevated load.


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