How do pulleys make work easier?
Pulleys hook onto a load and help carry heavier objects to higher or lower places. The pulley changes the direction of force you have to use to lift the load. If you use more than one pulley, the mass of the load will divided between the number of pulleys.
THE Creator of THE PULLEY
The pulley was created by a Greek inventor by the name of Archimedes. Archimedes designed the pulley, as well as the compound pulley.
Description of the pulley
A pulley is made from a rope or chain and a wheel. The pulley attaches itself to objects by using the hook tied to one end of the rope or ropes. One or more ropes can be used in a pulley. This increases the amount of mass you can lift. The rope/ropes are wrapped around the wheel, and the other end of the rope(s) is where you pull to lift the load. The rope(s) fit in the groove of the wheel. Pulleys can move right, left, up, and down. To move heavy loads, you need more than one pulley, or longer rope. A pulley is basically a wheel and axle with a rope or chain attached.
What are examples of modern day pulleys?
credits
- https://www.brainpop/com/technology/simplemachines/pulley/quiz/
- http://classroom.synonym.com/ancient-greek-invention-pulley-9468.html
- http://www.madsci.org/posts/archives/2002-04/1018042569.Sh.r.html
- http://atlantis.coe.uh.edu/archive/science/science_lessons/scienceles1/pulley.htm
- http://legacy.mos.org/sln/Leonardo/inventorsToolbox.html
- http://teacher.scholastic.com/dirtrep/simple/pulley.htm
- http://science.howstuffworks.com/transport/engines-equipment/pulley.htm?printable=1
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