20. Torques and Gyroscopes

20. Torques and Gyroscopes - 5. What is meant by a wheel...

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THE MECHANICAL UNIVERSE Name:  Mai Nguyen                                                                                 Video 20. Torques and Gyroscopes   Class: PHYS 2425 1P1                                     1. What 3 quantities never change? Energy, momentum and angular momentum 2. What is Newton’s Third Law really about? When work is going into one body its always going out somewhere else; the conservation of angular momentum; torque is conserved. 3. When was the wheel probably invented? 4000 B.C. 4. Define torque: twisting force that causes rotation; ( R x F)
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Unformatted text preview: 5. What is meant by a wheel precessing? Once the wheel starts spinning and there is an outward velocity, outward on one side and inward on the other. 6. Explain how a gyroscope can be used to aid navigation? If its balanced at its own center of mass, gravity wont make it precess; the axis will remain stable and keep the gyroscope pointed in the same direction; like a compass. 7. What is the best gyroscope on earth? Earth itself. 8. What is an equinox? When day and night have equal length. 9. In which direction do the equinoxes drift? Very slowly to the west. 10. How long does it take for the earth to precess once? 26000 years...
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20. Torques and Gyroscopes - 5. What is meant by a wheel...

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