I’ve always seen them on TV, and in professional garages and factories. I know they allow you to lift things far heavier than you normally could. But, how do they actually do that? I have seen that you pull one chain alot and it lifts it a little, so I’m sure that has something to do with it.
In: Engineering
It’s really hard to describe simply but the most coherent I can make it is by saying that for each line the forces are distributed against the pulley. If you were to lift a 100 lb object with just a pulley you would need to exert 100 lbs of force. However with a block and tackle wrapped once there is now another “rope” taking half the weight of the object so now you only need to exert 50 lbs to lift it (the system doubles your effort.) With more repetitions in the block the greater the force is multiplied.
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