Conceptual Torque/Angular Momentum question

In summary, the conversation discusses the behavior of a spinning bicycle wheel mounted on an axle. When the axle is held horizontally, the direction of the angular momentum vector is to the right. When the axle is rotated clockwise in a vertical plane, the left side of the wheel moves into the page and the right side moves out, due to the torque exerted on it. This behavior can be explained by the principles of a gyroscope, as demonstrated in the diagram provided.
  • #1
mc8569
25
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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
 
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  • #2

Related to Conceptual Torque/Angular Momentum question

1. What is conceptual torque/angular momentum?

Conceptual torque and angular momentum are both concepts in physics that describe the rotational motion of an object. Torque is the measure of the force that causes an object to rotate, while angular momentum is a measure of the object's rotational inertia and speed.

2. How is torque/angular momentum calculated?

Torque is calculated by multiplying the force applied to an object by the distance from the point of rotation. Angular momentum is calculated by multiplying an object's moment of inertia (a measure of its mass and distribution) by its angular velocity (the rate at which it rotates).

3. What is the difference between torque and angular momentum?

The main difference between torque and angular momentum is that torque is a measure of the force that causes rotation, while angular momentum is a measure of the object's rotational motion itself. Torque can change an object's angular momentum, but angular momentum can also be changed by changing an object's mass or rotational speed.

4. What are some real-life examples of torque/angular momentum?

There are many examples of torque and angular momentum in everyday life. One common example is a bicycle wheel, where the pedals apply torque to the wheel to make it rotate. Another example is a spinning top, where the angular momentum keeps the top upright as it rotates. In sports, throwing a ball or swinging a bat also involves torque and angular momentum.

5. How does torque/angular momentum relate to the conservation of energy?

Conservation of energy is a fundamental law of physics that states that energy cannot be created or destroyed, only transferred or transformed. Torque and angular momentum are both related to this law, as they involve the transfer and transformation of energy in rotational motion. In a closed system, the total torque and angular momentum will remain constant, demonstrating the conservation of energy.

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