A wheel is a mechanical an equipment that deserve to be supplied to lift heavily objects much more easily. Pulleys consists a wheel that rotates on one axle—which is a rod with the facility of the wheel—and a rope, cable, or chain. There space three main types of pulleys: fixed, movable, and compound.

You are watching: Mechanical advantage of single fixed pulley

A fixed pulley’s wheel and axle stay in one place. A good example the a fixed pulley-block is a flag pole: as soon as you pull under on the rope, the direction of pressure is redirected through the pulley, and also you progressive the flag.


A movable pulley is a wheel that is cost-free to relocate up and down, and is attached to a ceiling or other object by two lengths that the very same rope. Examples of movable pulleys include building cranes, modern-day elevators, and also some species of weight lifting makers at the gym.

The third kind of sheave is the compound pulley, which is composed of combine of fixed and movable pulleys.

Problem

Which sheave setup renders lifting a heavy load easiest?

Materials

2 tall surfaces the the same elevation (tables, countertops, or a countertop and also a table)3 2”x4” wood planks, long enough to expectancy the distance in between the high surfaces4 addressed pulleys2 movable pulleysRope that fits the pulleysScrewsScrewdriver or drillToolbox through handleTools, books, and also other objects to include weight come the toolboxScale

Procedure

Fixed pulleyUsing the screws and a driver or drill, connect one fixed pulley to the facility of a 2x4 plank.Feed the rope with the pulley.Attach one finish of the rope come the toolbox handle.Place a couple of objects in the toolbox till it feels heavy. Sweet the toolbox top top the scale. Record its weight.Set the wood plank between your 2 tall surfaces so the pulley is facing down.


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Pull down on the cost-free end the the rope and also lift the toolbox. Document your observations. Just how much have the right to you lift through the aid of the resolved pulley?Movable PulleyUsing the screws and also your screwdriver or drill, attach one fixed pulley-block to a suggest slightly off-center on one of your 2”x4” plank.Feed the rope with the pulley.Feed one end of the rope v a moveable pulley.Attach the finish of the rope fed despite the movable pulled to the 2x4 plank, around 1 foot away from the fixed pulley.Set the wood plank in between two high surface so the pulleys are dealing with down. The movable pulley will cave down prefer this.


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Attach the take care of of the toolbox to the movable pulley.Place different objects in the toolbox till it is heavy. Sweet the toolbox top top the scale.Pull down on the complimentary end the the rope and also lift the toolbox. Record your observations. Exactly how much can you lift through the aid of the movable pulley?Compound PulleyUsing the screws and your driver or drill, affix two resolved pulleys about a foot except each other on a 2”x4” plank.Feed the rope through a movable pulley.Feed every side the the rope with the addressed pulleys therefore the movable sheave hangs between the solved pulleys.Set the wood plank in between two high surface so the pulleys are dealing with down.


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Attach the handle of the toolbox to the movable pulley.Place various objects in the toolbox until it is heavy. Load the toolbox top top the scale.Pull under on the complimentary ends of the rope and lift the toolbox. Document you observations. Just how much have the right to you lift through the assistance of the movable pulley?

Results

The fixed pulley-block will do the toolbox most challenging to lift. The moveable pulley-block will do the toolbox much easier to lift. The compound pulley mechanism will make the toolbox easiest to lift.

See more: How Many Pounds Is 60 Kg To Lbs), 60 Kg To Lbs (60 Kilograms To Pounds)

Why?

Movable pulleys give you a mechanical advantage, which is measure up of performance for machines. Having actually a mechanically advantage means the force applied by the device is higher than the force you put in. In a wheel system, this way the pulley can lift the object with a better amount of pressure than you apply to the rope. This enables you come lift heavy things an ext easily.

Here’s the catch—even though the moveable pulley system and also the compound pulley device let friend lift a hefty object through less pressure than you’d have to use through a resolved pulley, you still had actually to relocate the rope farther. The pressure exerted top top the toolbox may have actually been increased, but you still had actually to execute the same amount the work on the rope. What this way is that also if the toolbox felt fifty percent as heavy with a moveable pulley, you’d have actually the traction the rope twice together far come raise the the exact same distance together a fixed wheel would!


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