Which Pulley Is Best For Making Lifting An Object Require Less Force? (Choose One) Fixed Movable

Science project

A Unmarried Movable Pulley and Mechanical Advantage

A pulley is a mechanical device that tin exist used to elevator heavily objects more easily. Pulleys consist of a wheel that rotates on an beam—which is a rod through the heart of the wheel—and a rope, cable, or concatenation. There are iii main types of pulleys: fixed, movable, and compound.

A fixed pulley's wheel and axle stay in one place. A good case of a fixed caster is a flag pole: When you pull down on the rope, the direction of force is redirected past the pulley, and you heighten the flag.

A movable pulley is a pulley that is complimentary to move up and down, and is attached to a ceiling or other object by two lengths of the aforementioned rope. Examples of movable pulleys include construction cranes, modern elevators, and some types of weight lifting machines at the gym.

The third type of pulley is the compound pulley, which consists of combinations of stock-still and movable pulleys.

Which pulley setup makes lifting a heavy load easiest?

ii tall surfaces of the aforementioned height (tables, countertops, or a countertop and a table)
3 ii"x4" wood planks, long plenty to bridge the distance betwixt the tall surfaces
4 stock-still pulleys
two movable pulleys
Rope that fits the pulleys
Screws
Screwdriver or drill
Toolbox with handle
Tools, books, and other objects to add weight to the toolbox
Scale

Fixed pulley

Using the screws and a screwdriver or drill, attach ane fixed caster to the center of a 2x4 plank.
Feed the rope through the pulley.
Attach one end of the rope to the toolbox handle.
Place a few objects in the toolbox until it feels heavy. Weigh the toolbox on the scale. Record its weight.
Set up the wooden plank between your two tall surfaces then the pulley is facing down.

Fixed Pulley

Pull down on the complimentary end of the rope and elevator the toolbox. Record your observations. How much can you lift with the help of the stock-still pulley?

Movable Pulley

Using the screws and your screwdriver or drill, adhere one fixed pulley to a point slightly off-eye on one of your 2"x4" plank.
Feed the rope through the pulley.
Feed ane stop of the rope through a moveable pulley.
Attach the cease of the rope fed though the movable pulled to the 2x4 plank, almost ane foot away from the fixed pulley.
Set the wooden plank betwixt 2 high surfaces so the pulleys are facing down. The movable caster will hang down like this.

Moveable Pulley

Adhere the handle of the toolbox to the movable caster.
Identify different objects in the toolbox until it is heavy. Counterbalance the toolbox on the scale.
Pull down on the free stop of the rope and lift the toolbox. Record your observations. How much can you lift with the assistance of the movable pulley?

Compound Pulley

Using the screws and your screwdriver or drill, adhere two fixed pulleys virtually a human foot apart from each other on a 2"x4" plank.
Feed the rope through a movable pulley.
Feed each side of the rope through the fixed pulleys so the movable pulley hangs between the fixed pulleys.
Prepare the wooden plank betwixt two high surfaces and so the pulleys are facing downwardly.

Compound Pulley

Attach the handle of the toolbox to the movable pulley.
Place different objects in the toolbox until it is heavy. Weight the toolbox on the calibration.
Pull down on the costless ends of the rope and lift the toolbox. Record you observations. How much tin you elevator with the assist of the movable pulley?

The fixed caster will brand the toolbox near hard to lift. The moveable caster will make the toolbox easier to lift. The chemical compound caster system will make the toolbox easiest to lift.

Movable pulleys give you a mechanical reward , which is measure of performance for machines. Having a mechanical advantage means the force applied by the system is greater than the force yous put in. In a caster system, this means the pulley can elevator the object with a greater amount of force than you utilize to the rope. This allows you to elevator heavy things more easily.

Here'due south the catch—even though the moveable pulley organization and the compound pulley system permit yous lift a heavy object with less force than you lot'd accept to use with a stock-still caster, y'all still had to movement the rope farther. The force exerted on the toolbox may accept been increased, but you still had to perform the same amount of work on the rope. What this means is that even if the toolbox felt half every bit heavy with a moveable pulley, you lot'd have the pull the rope twice as far to raise information technology the aforementioned distance as a fixed caster would!

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