What is the effiency of single movable pulley
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A movable pulley is a pulley that is free to move up and down, and is attached to a ceiling or other object by two lengths of the same 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 fixed and movable pulleys.
Materials
2 tall surfaces of the same height (tables, countertops, or a countertop and a table)3 2”x4” wood planks, long enough to span the distance between the tall surfaces4 fixed pulleys2 movable pulleysRope that fits the pulleysScrewsScrewdriver or drillToolbox with handleTools, books, and other objects to add weight to the toolboxScale
Procedure
Fixed pulley
Using the screws and a screwdriver or drill, attach one fixed pulley 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 the wooden plank between your two tall surfaces so the pulley is facing down.

Pull down on the free end of the rope and lift the toolbox. Record your observations. How much can you lift with the assistance of the fixed pulley?
Movable Pulley
Using the screws and your screwdriver or drill, attach one fixed pulley to a point slightly off-center on one of your 2”x4” plank.Feed the rope through the pulley.Feed one end of the rope through a moveable pulley.Attach the end of the rope fed though the movable pulled to the 2x4 plank, about 1 foot away from the fixed pulley.Set the wooden plank between two high surfaces so the pulleys are facing down. The movable pulley will hang down like this.

Attach the handle of the toolbox to the movable pulley.Place different objects in the toolbox until it is heavy. Weigh the toolbox on the scale.Pull down on the free end of the rope and lift the toolbox. Record your observations. How much can you lift with the assistance of the movable pulle
The third type of pulley is the compound pulley, which consists of combinations of fixed and movable pulleys.
Materials
2 tall surfaces of the same height (tables, countertops, or a countertop and a table)3 2”x4” wood planks, long enough to span the distance between the tall surfaces4 fixed pulleys2 movable pulleysRope that fits the pulleysScrewsScrewdriver or drillToolbox with handleTools, books, and other objects to add weight to the toolboxScale
Procedure
Fixed pulley
Using the screws and a screwdriver or drill, attach one fixed pulley 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 the wooden plank between your two tall surfaces so the pulley is facing down.

Pull down on the free end of the rope and lift the toolbox. Record your observations. How much can you lift with the assistance of the fixed pulley?
Movable Pulley
Using the screws and your screwdriver or drill, attach one fixed pulley to a point slightly off-center on one of your 2”x4” plank.Feed the rope through the pulley.Feed one end of the rope through a moveable pulley.Attach the end of the rope fed though the movable pulled to the 2x4 plank, about 1 foot away from the fixed pulley.Set the wooden plank between two high surfaces so the pulleys are facing down. The movable pulley will hang down like this.

Attach the handle of the toolbox to the movable pulley.Place different objects in the toolbox until it is heavy. Weigh the toolbox on the scale.Pull down on the free end of the rope and lift the toolbox. Record your observations. How much can you lift with the assistance of the movable pulle
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