Why is there a twofold gain in strength when using a movable block?

Force F2, with which the load acts on the movable block due to the fact that the block is held on two identical ropes, is divided by 2. The tension force of one rope is the same everywhere. The rope is pulled with a force F1, the value of which is 2 times less than the force F2, with which the load is pulled down.



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