How does rotation have vectors?

  • Context: High School 
  • Thread starter Thread starter NYGooner
  • Start date Start date
  • Tags Tags
    Rotation Vectors
Click For Summary
SUMMARY

This discussion clarifies the application of vectors in the context of rotation, specifically using the right-hand rule to determine angular velocity and angular momentum. The right-hand rule indicates that for clockwise rotation, the angular vector points downward, while for counter-clockwise rotation, it points upward. It is emphasized that rotation itself does not possess vectors; rather, vectors such as angular velocity describe the rotational motion. The instantaneous velocity of a point on a rotating object, like a vinyl record, is tangential to its circular path, not in the direction of the angular vector.

PREREQUISITES
  • Understanding of angular velocity and angular momentum
  • Familiarity with the right-hand rule in physics
  • Basic knowledge of rotational motion concepts
  • Ability to visualize motion in circular paths
NEXT STEPS
  • Study the right-hand rule in detail for various rotational scenarios
  • Learn about angular momentum conservation in physical systems
  • Explore the relationship between tangential velocity and rotational motion
  • Investigate applications of angular velocity in real-world systems, such as gyroscopes
USEFUL FOR

Students of physics, educators teaching rotational dynamics, and anyone interested in understanding the principles of motion and vectors in rotational systems.

NYGooner
Messages
3
Reaction score
0
In my textbook they used the right hand rule to show that rotation has vectors instead of just being positive or negative relative to its direction of rotation of a vinyl record. In the image the record was going clock wise so by the right hand rule it was going downward which makes sense, but are they also saying that if it was counter-clock wise then by the right hand rule it would have a vector in the upward direction? Does that mean it would move upward? I'm sorry if this sounds dumb, I just can't understand how we can apply vectors to rotation.
 
Physics news on Phys.org
There are a couple of inaccurately used words in your statement.
1. "rotation has vectors". Rotation is a type of motion. It does not "have" vectors.
2. "In the image the record was going clock wise so by the right hand rule it was going downward which makes sense". You said "it" was going downward. Ask yourself the question: What was going downward? Certainly not the vinyl record. It is NOT going downward. It is only going round and round.
3. There is a si,i;ar statement about counter-clockwise rotation.
The vector you are talking about does not give the direction of motion. Think of a tiny spot on your vinyl record. It is going round at the same rate as the record. At any instant, the spot is moving in a specific direction. That is the direction of the instantaneous velocity, and it is tangential to the circle in which the spot is moving.
The vector that the right hand rule shows is the ANGULAR VELOCITY, or ANGULAR MOMENTUM. Nothing is actually moving in the direction of these vectors. Rather, something is rotating around these vectors. The direction of rotation and the direction of the vector are related by the right hand rule.
 
  • Like
Likes   Reactions: NYGooner
Sorry for the complicated wording, I just wasn't sure how to word this question. Thanks for clearing it up though, it makes sense now, thanks!
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 0 ·
Replies
0
Views
1K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 10 ·
Replies
10
Views
1K
  • · Replies 8 ·
Replies
8
Views
2K