Conceptual Torque/Angular Momentum question

Click For Summary
When a spinning bicycle wheel is held horizontally and rotated in a vertical plane, the angular momentum vector points to the right. Applying torque causes the axle to experience gyroscopic precession, resulting in the left side moving into the page and the right side moving out. This movement occurs because the torque direction is perpendicular to the angular momentum, causing a change in orientation. The interaction between the applied torque and the existing angular momentum leads to this unique motion. Understanding this concept is essential for grasping the principles of gyroscopic behavior.
mc8569
Messages
25
Reaction score
0
I just need an explanation:
A spinning bicycle wheel is mounted on an axle you can hold in your hands. You hold it in front of you with the axle horizontal. The direction of the angular momentum vector is to your right. You then rotate the axle clockwise in a vertical plane as seen by you. Because of the torque you exert on it the axle will additionally tend to turn (as seen by you) so that the left side moves into the page and the right side moves out.

Why would the left side move into the page and the right side move out?

Here's the diagram:
http://i41.tinypic.com/2mrilxw.png

L is pointing down the right side of the rod, so the wheel is spinning "towards" you (the viewer).

Someone please explain this to me! Thanksss
 
Physics news on Phys.org
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

Similar threads

Replies
17
Views
2K
  • · Replies 17 ·
Replies
17
Views
899
  • · Replies 25 ·
Replies
25
Views
11K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 10 ·
Replies
10
Views
1K
  • · Replies 4 ·
Replies
4
Views
1K
Replies
2
Views
3K
  • · Replies 2 ·
Replies
2
Views
4K
Replies
335
Views
16K
  • · Replies 11 ·
Replies
11
Views
5K