I was under the impression that someone got in on the ground and then made the arm go up while carrying things and at the end of the day, the person made the arm go down and went home.
But cranes are always up at night. So what do they do? How do they work?
In: Technology
Cranes work because of pulleys. If you want to lift something off the ground, you are actually lifting the weight of the object and the weight of yourself also. It’s the most ineffecient way to lift something.
It’s a lot easier to lift something if you use a pulley. Basically tie a rope to the load and feed it through a “block”, so that you pull down on the rope, and the object goes up.
It’s easier to pull down on the rope because you have gravity working with you, not against you.
The interesting thing is that if you add more ropes and more blocks, you increase the mechanical advantage. So if I tie multiple ropes to the object and feed them through many blocks in the same setup as before, you can pull the rope down with an input force of let’s say 1 and the object would be lifted by let’s say 4 ropes and you would have 4 times the lifting power.
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