Discussion
Consider the following statements about gyroscopic properties:
1. Rigidity in space keeps the axis fixed unless a torque acts.
2. Precession appears 90 degrees from the applied force in the direction of spin.
3. Precession rate is proportional to angular momentum.
Which of the statements given above is or are correct?
Answer: B
Correct answer: 1 and 2 only
The first two are correct: rigidity in space is the axis holding its direction absent a torque, and precession appears 90 degrees from the applied force in the direction of rotor rotation.
The third inverts the relation. Precession rate is \( T/I\omega \), so it is inversely proportional to angular momentum - which is the whole reason a fast heavy rotor makes a good reference and a slowing one does not.
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