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# Questions tagged [angular-momentum]

The conserved quantity arising from a rotational invariance. Combine with rotational-dynamics for the classical mechanics approach and quantum-mechanics for the QM interpretation

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### How to understand zero elements in CG coefficient table?

I understand the standard theory of angular momentum and the reps. of SU(2). I found there are some zero elements in CG coefficient table. I can derive them by using the recurrence relations between ...
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### How much should the disk/wheel spin for gyroscopic-precession to take place? Is there a threshold?

Suppose we have a spinning gyroscope whose disk is of mass $m$, spinning at angular velocity $\omega$, and attached to a rod of length $r$. The precession of the gyroscope around the $z$-axis will be ...
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### How? Calculate torque from twisting a gyroscope

Please be patient, I'm not a physics guy. I'm building a robot that flips itself over using a gyroscope. The gyroscope spins horizontaly at first, then a servo changes the gyro's rotating axis, ...
1 vote
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### Angular velocity - Gyroscope

I am currently researching the gyroscope on my own and i came across the concept of angular velocity. The torque ($T$) on a gyroscope is caused by $R\cdot F$, where the force i consider it to be ...
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### Rotation of a Spinor

I have a question about an intuitive approach to spinors as certain mathematical objects which have properties that make them similar to vectors but on the other hand properties which differ them from ...
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### Why should a motorcyclist hit the brakes to make his motorcycle tilt in midair?

Ok, so here's the setup of the problem. A motorcyclist tries to jump over some cars by using a ramp. Right after he leaves the take-off ramp, he notes that his motorcycle is angled slightly upward and ...
1 vote
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### How much force is required to break precession?

Gravity, in this diagram, provides a downward force creating a torque that causes the wheel to precess around the chain. This is cool but counter intuitive, and I am wondering what force is needed to ...
1 vote