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You are on the right track. Some machines are reversible and some not. Feynman has shown that of all machines, reversible are best, in that no machine can lift a weight higher. He has shown that all reversible machines are equally good - they all lift a weight equally high. Here the enormously elaborate system of levers is a machine that may or may not be ...


2

Firstly, you confuse the 1st and the 2rd Newton laws. The 1st Newton laws states that there are such reference frames, called inertial reference frames, where an object, not acted upon by a force, will stay at rest or move with a constant velocity. The other Newton laws apply only in these reference frames. Secondly, perpetuum mobile means doing useful work ...


1

While there is some net force on an object, by second Newton’s law there will be acceleration in the direction of the net force. When there is some non-zero acceleration, velocity of the object increases or decreases linearly with time. If net force stops acting on the object, by first Newton’s law the object will remain in equilibrium. Equlibrium means that ...


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