Pulley System: Aarav, Parth, Pushti, Shreya and Viraj

PULLEY SYSTEM
AARAV,PARTH,PUSHTI,SHREYA AND VIRAJ

What is a pulley system?
 The pulley definition refers to a wheel that constitutes a cord surrounding its rim. These
devices mainly contribute to mechanical advantage while lifting weights above the ground
level. You can see this instance of mechanical devices mounted on a well to pull buckets of
water. As a result, it forms one of the main factors to reduce reliance on limited human
strength. Also, this mechanism manipulates the direction of force to make specific
processes efficient. As a result, it acts as a force multiplier. On the other hand, a pulley set
may contain one or more wheels as per one’s requirements. In the case of multiple wheels,
you can refer to it as a compound pulley.
Types of pulleys
• Fixed pulley - A fixed pulley’s
wheel and axle stay in one place.
A fixed pulley changes the
direction of the force on a rope or
belt that moves along its
circumference. A good example
of a fixed pulley is a flag pole:
When you pull down on the rope,
the direction of force is redirected
by the pulley, and you raise the
flag.
• Movable pulley - A movable pulley is one in which the drum moves as you are moving the load. There
is no change in the direction of the force that you need to apply, but the load will “feel” lighter than it is.
• Compound Pulley - In a compound pulley system, there is both a moveable pulley as well as a fixed
pulley. This means that not only does the load “feel” lighter, but you can also change the direction of the
force.
 Cone Pulley - Cone pulleys are essentially multiple pulleys of decreasing vertical circumference on
top of each other, forming a cone shape. This cone shape allows the pulley operator to transfer the speed
of the pulleys’ movements, requiring less work with a smaller circumference, but also producing less
work. Multi-gear bicycles essentially operate on the same system
 Block and Tackle pulley - A block and tackle are a specific forms of compound pulleys that can
dramatically reduce the amount of work required to move a heavy object. A block and tackle pulleys
system consists of several fixed and movable pulses arranged parallel to each other; a Fixed pulley is
aligned with fixed and movable pulleys with movables.
Various uses of a pulley system
 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.
 Construction pulleys are used in order to lift and place heavy materials.
 Curtains at a theatre are moved using pulley systems that pull the curtains apart.
 Blinds on windows operate using a pulley system to move the blinds up and down. You
pull the cord on the blinds and the pulley system causes the blinds to open or close.
 Flagpoles use pulleys in order to hoist the flag up or to bring it down. You pull the string
on the pulley and the flag runs up or down the pole
Use of pulley systems at
construction sites
A pulley system is an easy way to lift
heavy objects, as compared to lifting the
object barehanded. A single pulley only
serves to change the direction of the
applied force. When two or more forces are
used in a system, then the pulley not only
changes the direction of applied for, but
also multiplies the input force. If one fixed
and one movable pulley is applied in a
system, the system almost doubles the
amount of force applied by a person.
How do pulley systems work
at construction sites ?
A pulley system is a collection of one or more

wheels which are used with a rope or chain to make it
easier to lift things. A basic pulley consists of a wheel
on a fixed axle, with a groove along the wheel's edge
to guide a rope or chain. The amount of force required
to lift the object is equal to the load.
Mechanical Advantage
Simple machines like the pulley give you a
mechanical advantage, essentially making
you stronger than you are in real life.
Physicists quantify the work the system does
by calculating mechanical advantage in
Newtons, named after Sir Isaac Newton, the
originator of the laws of motion. It takes 1
newton to move 1 kilogram of mass at the
rate of 1 meter per second squared in the
direction of the applied force. To calculate
the mechanical advantage of a pulley, divide
the output force, the weight of the load by
the input force, the force needed to lift the
load.
ADVANTAGES OF PULLEYS
⦁The main advantage of the use of pulleys is that the effort becomes less as compared to the
normal lifting of the weights. In other words, it reduces the amount of actual force required
to lift heavy objects. It also changes the direction of the force applied. These two advantages
in the use of pulleys make them an important tool for heavy lifting.
⦁The other advantage in the use of pulleys is that the distance between the operator and
weight. There is a safe distance between them which avoids any disaster.
⦁Pulleys are easy to assemble and cost-effective. The combination of different directional
pulleys can change the position of the load with little effort. Though there are moving parts
in the pulley system they require less or no lubrication after installation.
⦁The most important and common advantage of the pulley is that while using a pulley the
effort becomes less to lift a weight as compared to normal lifting.
⦁It mainly reduces the actual amount of force required to lift heavy objects.
⦁There will be a safe distance while lifting the weight which can avoid any disaster.
⦁Another advantage of the pulley system is that it is easily assembled and cost-effective.
⦁If we put a number of different directional pulleys it can reduce a lot of effort to lift the
weight.
⦁There are some parts of the pulley which after installation require less or no lubrication.
DISADVANTAGES OF PULLEYS
⦁The main disadvantage in the use of the pulley system is that it requires a
large space to install and operate.
⦁In some cases, the ropes move over the wheel with no grooves, the chances
of the slip of ropes from the wheel are inevitable. If the system is installed
to use for a long time, they require maintenance and regular check-up of
ropes as the friction between the wheels and cables occurs causing wear and
tear to them. Continuous use of the system makes the ropes weak. The rope
may break while using the system causing damages to the operator,
surrounding the place, and the load which is being lifted.
⦁Pulley requires a large space to install.
⦁There are chances of slipping while using rope over the wheels with no
grooves.
⦁Continuous use of rope makes the ropes weak. The rope can break
sometimes while used by the operator causing trouble sometimes.

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PULLEY SYSTEM

AARAV,PARTH,PUSHTI,SHREYA AND VIRAJ

 Elevators use multiple pulleys in order to function.

A pulley system is a collection of one or more

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