query: Perpetual motion machine
positive_passages.docid: 921
positive_passages.text: Can magnets rotate infinitely?
negative_passages.docid: 54866
negative_passages.text: Fluid filled harmonic oscillator
negative_passages.docid: 32790
negative_passages.text: Gyroscope's motion explained by internal forces
negative_passages.docid: 117884
negative_passages.text: Why isn't perpetual motion possible, even though we are so technologically advanced?
negative_passages.docid: 146932
negative_passages.text: Centrifugal force acting on ring
negative_passages.docid: 17753
negative_passages.text: Positive work done by friction
negative_passages.docid: 142162
negative_passages.text: Alien surface transport that walks, not rolls
negative_passages.docid: 141750
negative_passages.text: Finding the steady state solution of a damped oscillator
negative_passages.docid: 98434
negative_passages.text: NASA's "Impossible" Space Engine
negative_passages.docid: 117801
negative_passages.text: Do circular wheels maximize mechanical efficiency?
negative_passages.docid: 5317
negative_passages.text: How does the second law of thermodynamics forbid the possibility of perpetual machine of the second kind?
negative_passages.docid: 142300
negative_passages.text: Winding number (demonstration)
negative_passages.docid: 71545
negative_passages.text: Pendulum in Accelerating Elevator
negative_passages.docid: 944
negative_passages.text: Conditions for vertical circular motion
negative_passages.docid: 151513
negative_passages.text: Linear motion with variable acceleration
negative_passages.docid: 129879
negative_passages.text: Converting a DC motor to a generator
negative_passages.docid: 30124
negative_passages.text: Story about machines generating energy with parallel universes, endangering ours