Quote Originally Posted by swiggidy
I didn't read wuf's post because it was long.

Perpetual motion as thought of commonly will not happen, because friction is always a loss. You could potentially design a machine that uses some source, aka light, or better the earth's magnetic field to generate enough energy to overcome this loss and produce a positive output.

Word
which would therefore be an engine that runs on renewable energy, not a perpetual motion machine.