## anonymous one year ago Gyroscopic procession question

1. anonymous

|dw:1433730100954:dw|

2. anonymous

|dw:1433730137138:dw|

3. anonymous

After drawing it out and thinking about it, it seems that things cancel out.

4. anonymous

|dw:1433730534260:dw| I was wondering is something like this would result in some sort of upward force.

5. anonymous

|dw:1433730674626:dw|

6. anonymous

For the arrows mixed up.

7. Kainui

So is this the right picture then? |dw:1433730753297:dw|

8. anonymous

Hmmm, I keep confusing myself with orientation

9. anonymous

They're spinning in opposite directions.

10. anonymous

I'm wondering, since they both balance on the beam, is there still procession from gravity?

11. Kainui

Well precession is a change in the angular momentum vector which is torque, so maybe we can work it out with some math, I'm not really sure what to do yet but I'll spit out what equations I know. $\large \bar \tau = \frac{d \bar L}{d t}$ $\large \bar L = \bar r \times \bar \omega$ $\large \frac{d \bar L}{dt} = \frac{d \bar r}{d t} \times \bar \omega + \bar r \times \frac{d \bar \omega}{dt}=\bar r \times \bar \alpha = \bar \tau$

12. Kainui

Hmmm that doesn't seem quite right I think I've left somthing out

13. anonymous

So procession is a torque that is done in reaction to a torque on the axis of rotation?

14. anonymous

Are you confusing angular velocity with angular momentum?

15. Empty

|dw:1434154506359:dw|