Why is it so difficult to build a perpetual motion machine?
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The ask of a PMM is to give you something for nothing. The third law of physics is that for every action there is an equal and opposite reaction; EQUAL
If you push a ball with x force, it will only accele by x force. If it goes faster, then some other force has to be acting on it. M
There will always be friction or air resistance or gravity or some forced which prevents more energy output than input.
You can’t have an infinite waterfall or an infinite newtons cradle because of friction, drag, and a host of other factors.
So, you’ll never get more out of something than you put into it. The best we can do is an output equal to the input
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