Yes the loads on the block will change but the loads on the rope stay the same. If you have a pull line attached to a tree and run it through a block on the ground and then back to another block attached to the line with a prussick you will have 3:1 (right or is it 2x?) set up behind the single...
The load on the rope remains constant on either side of the pulley. If you are standing under a branch with a pulley on it and run a rope through said pulley to a 100kg weight next to you it will require ~100kg of pull on your side to lift the weight. The branch and inherently the sling...
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