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
If you want to lift something up, you’ve got to use your muscles. We call the amount of strength you use “force”. You’re only so strong, so there’s a limit to how much force you can use.
Moving a heavy box a short distance isn’t as hard as moving it a long distance. It’s more work. Work is force x distance. It’s how much effort or energy you need to move something from one place to another before you’re exhausted (out of energy).
If you want to lift something, it’s work. What if it’s heavy, though? Maybe you’re not strong enough to force it to move? What if you wanted to cut the amount of force you need (because you’re only so strong) to do that work?
Work = force x distance
You can halve the force if you double the distance to do the same work. If you have a lever where on end moves 1’ while you push the other end 2’, the force on the side moving 1’ is double the force moving 2’ but the work stays the same. If you have two gears, one with twice as many teeth as the other, the small gear turns with double the force of the other – again, 2x distance x ½ force.
In the case of a pulley, the cable loops from the top and back up again so that every 2’ you reel in of cable the pulley moves 1’. By doubling the distance that you apply the force, you halve the force needed to do the work.
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
If you want to lift something up, you’ve got to use your muscles. We call the amount of strength you use “force”. You’re only so strong, so there’s a limit to how much force you can use.
Moving a heavy box a short distance isn’t as hard as moving it a long distance. It’s more work. Work is force x distance. It’s how much effort or energy you need to move something from one place to another before you’re exhausted (out of energy).
If you want to lift something, it’s work. What if it’s heavy, though? Maybe you’re not strong enough to force it to move? What if you wanted to cut the amount of force you need (because you’re only so strong) to do that work?
Work = force x distance
You can halve the force if you double the distance to do the same work. If you have a lever where on end moves 1’ while you push the other end 2’, the force on the side moving 1’ is double the force moving 2’ but the work stays the same. If you have two gears, one with twice as many teeth as the other, the small gear turns with double the force of the other – again, 2x distance x ½ force.
In the case of a pulley, the cable loops from the top and back up again so that every 2’ you reel in of cable the pulley moves 1’. By doubling the distance that you apply the force, you halve the force needed to do the work.
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