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you anchor a rope at one end to make an moveable pulley to achieve a mechanical advantage of 2. you lift the o

Jun 09, 2008 by crystal | Posted in Engineering

you anchor a rope at one end to make an moveable pulley to achieve a mechanical advantage of 2. you lift the object 5m off the ground, how much rope have you pulled throught the pulley?
a. 2m
b. 5m
c. 7m
d. 10m

10 m, since you have a mechanical advantage of 2, that means that with half the force you can lift the object. The thing is that you need to make the same work, so you have to pull double the amount of rope in order to lift the object 5m

Hope

Lego Movable Pulley 3:1

A Lego movable pulley system that has a 3:1 work reduction ratio. Perhaps in the near future I will build a 4 or 5 reduction pulley.

Single movable & Single Fixed Pully System

Cooper's science project