How does it work metal wires, and pulleys?
Had a quick chat with a crane operator, using a wire for lifting. Asked what the max load he could lift. He said X amount, but if he uses a pulley, he could lift almost 2 times X.
Is this true? Is there a max to how many pulleys you can use/weight you can lift
Is the lifting curve linear or exponential?
TYIA
In: 20
You can think of pulleys as levers. Loop a rope through a pulley hanging from the ceiling, loop it through a loose one sitting on the floor, then connect the rope end to the ceiling. When you pull on the loose end, the loose pulley will rise up half as far as you pull, because the amount of rope you’ve pulled is split between the segment going from the pulley on the ceiling to the loose pulley, and the segment from the loose pulley to the end connected to the ceiling. Just like a lever, you’ve doubled the amount you can lift, but halved the distance you can move it for a given amount of effort.
In a frictionless world, there would be no limit to how many pulleys you can use (with a long enough lever, I could move the world) But apart from friction (and a finite amount of rope on earth), there isn’t much else stopping you from using all the pulleys you’d like.
How does it work metal wires, and pulleys?
Had a quick chat with a crane operator, using a wire for lifting. Asked what the max load he could lift. He said X amount, but if he uses a pulley, he could lift almost 2 times X.
Is this true? Is there a max to how many pulleys you can use/weight you can lift
Is the lifting curve linear or exponential?
TYIA
In: 20
You can think of pulleys as levers. Loop a rope through a pulley hanging from the ceiling, loop it through a loose one sitting on the floor, then connect the rope end to the ceiling. When you pull on the loose end, the loose pulley will rise up half as far as you pull, because the amount of rope you’ve pulled is split between the segment going from the pulley on the ceiling to the loose pulley, and the segment from the loose pulley to the end connected to the ceiling. Just like a lever, you’ve doubled the amount you can lift, but halved the distance you can move it for a given amount of effort.
In a frictionless world, there would be no limit to how many pulleys you can use (with a long enough lever, I could move the world) But apart from friction (and a finite amount of rope on earth), there isn’t much else stopping you from using all the pulleys you’d like.
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