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Give me a little time for the hysteresis. For the weight, we should use the term "apparent weight", because for us, in our environment, the mass is never affected by only the gravity. Plenty of factors play on it and the resulting force can vary greatly. In a static way, it could be...

I take this experiment as a valuable approach. There isn't any magic here and the mass of the hanging load surely doesn't change. But the hand added some force transiently in the system, which adds (or subtracts if opposite) to the weight of the load. Same with dynamic. The weight is a force...

That's because your rope is glued in the crotch by the sap :D Grendel, look at it this way : With a basal anchor in Srt, you try to lift the bottom of the tree when you pull yourself up, (actually, all the tree if the tying point is in an other tree). You get a climber and a part of the tree...