Paul+Missfeldt


 * Flat Stanley Learns About Pulleys **

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Pulleys are used to lift objects. With one pulley at the top, there is a 1:1 ratio. The force needed to lift the load is the same as the load.



With one movable pulley there is a 2:1 ratio. The force needed to lift the load is 1/2 the load, but you will pull line 2 times the height lifted.



With two moveable pulleys there is a 4:1 ratio. The force needed to lift the load is 1/4 the load, but you will need to pull line 4 times the hight lifted.

Flat Stanley is excited about what he learned about pulleys. He is able see how this knowledge is related to math and science.

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Flat Stanley Audio File