If I spinned a fan in a vacuum it will keep spinning forever. Why can we not make energy out of it?
921
Can magnets rotate infinitely?
137673
Energy for burning things!
100434
Would there be centrifugal force if I were alone in the universe?
126222
Why does air remain a mixture?
57525
Why does an electric motor burn up when you physically stop it?
78910
What causes matter to initially rotate/spin/orbit?
43287
The Spinning Log "Perpetual Motion" problem, and my attempt at a solution
3471
Why does holding something up cost energy while no work is being done?
63700
Why doesn't an orbiting body keep accelerating?
125653
How does a spinning electron produce a magnetic field?
82061
How do chemical propulsion systems not break the law of conservation of energy?
21256
If energy can neither be created nor be destroyed,what is the ultimate source of energy?
102570
How can I repair a ceiling fan that hums, but doesn't turn?
22490
Does it take energy to move something in a circle?
74101
How is a vacuum able to propagate light?
57098
Is perpetual motion impossible?
94884
If friction acts on car all time, why is it not accelerating forever?