Understanding Torque in Gyroscopes: A Question of Reference Frames

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SUMMARY

The discussion centers on the relationship between torque and reference frames in gyroscopes, specifically addressing the equation dL/dt = τ = ω x L. The participants confirm that dL/dt represents the torque of the flywheel, while ω x L denotes the torque around the axis of precession. Dimensional analysis is recommended as a method to validate these assumptions. The conversation also explores the implications of different reference frames, questioning whether one is inertial and the other fixed within the body of the gyroscope.

PREREQUISITES
  • Understanding of angular momentum (L) and torque (τ) in physics
  • Familiarity with gyroscopic motion and precession
  • Knowledge of vector cross products (ω x L)
  • Basic principles of reference frames in classical mechanics
NEXT STEPS
  • Study the principles of angular momentum conservation in gyroscopes
  • Learn about dimensional analysis techniques in physics
  • Explore the differences between inertial and non-inertial reference frames
  • Investigate the effects of torque on gyroscopic stability and motion
USEFUL FOR

College students, physics enthusiasts, and educators involved in mechanics, particularly those studying gyroscopic systems and torque dynamics.

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I am a college student currently working on a physics project involving gyroscopes. Using the equation below (taken from Wikipedia), am I correct in assuming that dL/dt is the torque of the flywheel and that ω x L is the torque of the gyroscope around the axis of precession?

e485ca275cca7135a34fb07cada3bf0a.png
 
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Did you try a dimensional analysis to check?
 
I know Simon Bridge probably did not want to give away the problem and suggested you try dimensional analysis. I will try another tack. Perhaps you can consider whether the reference frame for the "total derivative" term on the right of the first equal sign is related to the reference frame where the torque is equal to the sum of terms on the left of the first equal sign. Is one reference frame inertial? Is one fixed in the body?
 

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