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But gravity is being used to convert potential energy into kinetic energy in that machine by the dropping of the track to make it so that the track just in front of the ball is the lowest point, helping the ball move around (also aided by pendulums and magnets to keep it moving)

So that difference in energy has to come from somewhere when power is generated by water moving from a reservoir above a dam to a lower level after passing through and powering turbines. The water molecule itself doesn't change into a different molecule so no endo- or exo-thermic reactions...

Take out the throw into the air and that PE exists, as you say it is converted into another form of energy if it were to drop to a lower height again (the potential energy which can be released as kinetic energy when gravity effects an object and makes it fall towards a lower point ergo gravity...

To if you had another wind up watch that only lasted for 2 days, they will be considered as efficient as each other? The video says it's much more efficient that other engines (mainly because we extract energy from that engine to power other things but this machine doesn't lose energy in...

The release of that potential energy has occurred due to gravity's effect on moving it from a greater height to a lower height (which is what i guess the previous poster was getting at when talking about the PE of the effect of gravity) And also does that single molecule of water (H2O), if...

If that floor underneath it were to suddenly vanish, and nothing else were to exert any force onto that object, what would happen to it? Would it stay put? or would it drop until it hit something to stop it falling further? - If it drops, then it surely has potential energy (the energy for...

The energy used to create that heat and sound is being replaced (maybe not by 100%) by the effects of the magnets, the loss of energy, and why it may not be a perpetual energy machine is because the magnets will lose this power over time if it is transporting this energy into the ball and that...

Hydro electric dams use gravity by way of moving water from one height to another and in the process turn turbines, does the water itself contain less energy at the start when it was in the reservoir compared to when it has reached the river (or whatever is being used to move the water away)...