Any real machine has an efficiency less than 1, which means that a perpetual motion machine is impossible--all it takes is one moving part disturbing the air or running on a bearing to make sure the machine will eventually stop due to friction turning its motion into heat.
(friction; turning; its motion; into heat) (an efficiency; means; that a perpetual motion machine is impossible) Context(an efficiency means,List([21, 59))):(a perpetual motion machine; is; impossible) (one moving part; disturbing; the air) (the machine; will stop; due to friction turning its motion into heat; T:eventually) (all; takes; it) (all it takes; is; one moving part disturbing the air or running on a bearing) Context(all it takes is,List([107, 122))):(Any real machine; has; an efficiency less than 1, which means that a perpetual motion machine is impossible)
an efficiency means,List([21, 59)) all it takes is,List([107, 122))
friction an efficiency a perpetual motion machine one moving part the machine all all it takes Any real machine
turning means is disturbing will stop takes is has
its motion into heat
that a perpetual motion machine is impossible
impossible
the air
due to friction turning its motion into heat T:eventually
it
one moving part disturbing the air or running on a bearing
an efficiency less than 1, which means that a perpetual motion machine is impossible