A load weighing 800 N is lifted with a fixed block. With what force is pulled on the free end of the rope?

The fixed block belongs to simple mechanisms, its main purpose is to change the direction of force. The fixed block does not change the magnitude of the force. The rope is pulled down, and the load rises up.
Since the load has a weight of 800 N, it acts on the rope with a force of 800 N. This means that with a force of 800 N you need to pull the free end of the rope.



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