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www.reference.com/science/pulleys-levers-4841034fa6bfb1a5

What Are Pulleys and Levers? Levers and pulleys are two types of simple machines that allow people to use less energy when performing work. A simple lever is a long pole or platform used to lift an object. In a simple pulley system, a rope looped around a wheel is used to raise and lower objects. ... relocating it changes the effectiveness of ...

en.wikipedia.org/wiki/Simple_machine

Simple machines are elementary examples of kinematic chains that are used to model mechanical systems ranging from the steam engine to robot manipulators. The bearings that form the fulcrum of a lever and that allow the wheel and axle and pulleys to rotate are examples of a kinematic pair called a hinged joint. Similarly, the flat surface of an ...

examples.yourdictionary.com/pulley-examples.html

Examples of pulleys include: 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.

study.com/.../simple-machines-lever-inclined-plane-pulley.html

The Pulley. The pulley isn't quite as common as the lever or inclined plane, but they still show up relatively frequently. For example, cranes use them to lift heavy objects for construction.

sciencing.com/examples-pulleys-everyday-life-7231681.html

A pulley is a simple machine designed to increase lift strength using a tracked wheel and a cord, rope or chain. These useful devices are applied often in modern-day machinery, with numerous examples of pulleys found in your community.

www.ufba.org.nz/images/documents/simplemachines.pdf

Simple machines may be adaptations of the lever, pulley or inclined plane. Levers Levers are used to transfer a force from one position to another. They may be used to multiply forces, change the direction of the force required or produce turning effects (torque). Examples of commonly encountered levers are: wheel barrow, see-saw and pliers.

lpsa.swarthmore.edu/.../MechTranslating/TransMechSysLeversPulleys.html

Massless pulleys act in very much the same way as the massless lever discussed previously. Consider the system shown below. The pulley has two radii, r 1 and r 2. If the pulley moves through an angle θ the distance x 1 is given by r 1 ·θ, and the distance x 2 is given by r 2 ·θ.

www.livescience.com/49106-simple-machines.html

Humans have invented six devices that combine to make work easier. These six simple machines are the wheel and axle, the lever, the inclined plane, the pulley, the screw and the wedge.

sciencing.com/levers-used-everyday-life-8435160.html

Tweezers and tongs are examples of levers that make it easy to lift or remove items, even though the items aren't heavy. Tweezers and tongs are third-class levers because the fulcrum is at one end and the load is at the other. You must use human effort in the center of the lever to pinch the tweezers or tongs to grasp and lift or remove materials.

idahoptv.org/sciencetrek/topics/simple_machines/facts.cfm

There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are related to each other. But, each has a specific purpose in the world of doing work. But what is work? Work is the amount of energy necessary to move an object.