Question

Quick Question!

If output work in a pulley system is always less than input work, why are pulleys used?

Answer 1

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Answer 2

To get mechanical advantage.

If you have a block and tackle, you can lift much heavier objects than you could with just a rope, with the tradeoff being that you have to pull the rope a longer distance.

Think of it like low gear on a bicycle when going up a steep hill. You don't go as far with each pedal revolution, but the pedals are easier to turn.

Answer 3

@whpalmer4 So would you say," With a larger force, the distance needed become smaller?" Thanks for the help, I really appreciate it! :D

Answer 4

No, I wouldn't say that. I might say that a collection of pulleys acts as a force magnifier, just like a lever allows you to lift heavy objects.

Answer 5

But is there a way to explain it using force and distance? (as the lab this is on involved work input and output equations)

Answer 6

@whpalmer4

Answer 7

Sorry, I went to bed right after my last response.

Yes, a pulley system allows you to use a smaller force acting over a longer distance.