Does rotational motion affect the translational motion?

Click For Summary
SUMMARY

The discussion centers on the relationship between rotational and translational motion in a flying object, specifically analyzing the forces acting in different reference frames. It establishes that while a body frame attached to the center of gravity experiences both translational velocity and rotational velocity, the inertial frame does not exhibit an equivalent Coriolis force (ω×ν). The conclusion is that inertial forces, including the Coriolis effect, are exclusive to non-inertial frames, confirming that no equivalent force exists in the inertial frame.

PREREQUISITES
  • Understanding of rotational dynamics and translational motion
  • Familiarity with inertial and non-inertial reference frames
  • Knowledge of vector calculus, particularly cross products
  • Basic principles of mechanics, including forces and motion
NEXT STEPS
  • Study the principles of inertial and non-inertial frames in classical mechanics
  • Learn about the Coriolis effect and its implications in rotating systems
  • Explore the mathematical representation of rotational motion using vector calculus
  • Investigate applications of rotational dynamics in aerospace engineering
USEFUL FOR

This discussion is beneficial for physics students, aerospace engineers, and anyone interested in the dynamics of flying objects and the effects of motion in different reference frames.

Avijit
Messages
2
Reaction score
0
A flying object is moving in 3D space having translational velocity and the object is also rotating. Consider a body frame (xb-yb-zb) attached to the C.G of the moving body. Hence the body attached frame is also translating and rotating (as the object is flying) with respect to a fixed inertial frame. The inertial frame(X-Y-Z) is attached and fixed at some specific location on ground(earth). Due to the effect of both translation and rotation a Coriolis kind of force (rotational velocity cross translational velocity) ω×ν will exist in body attached frame (xb-yb-zb). Here ω: Rotational velocity of the flying object, v: velocity of the object represented in body attached frame (xb-yb-zb).

I would like to know :
Does any equivalent force of ω×ν will exist in the inertial frame? In other words, using the frame transformation (from body attached frame to inertial frame) can we realize the ω×ν effect in inertial frame?
 
Physics news on Phys.org
In your described scenario, every point in the body is at rest with respect to the rotating coordinates, so there's no Coriolis force. Remember the rotating reference frame is attached to the center of mass of the object, so there's no translational velocity in that frame.
 
upload_2016-12-15_7-41-16.png
here is the equation in body fixed frame
where U V W are velocity component of moving body represented in body frame. P Q R are body rotation rates in respective direction
 
Last edited:
Avijit said:
Does any equivalent force of ω×ν will exist in the inertial frame?
No, inertial forces exist only in non-inertial frames.
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 28 ·
Replies
28
Views
4K
  • · Replies 13 ·
Replies
13
Views
2K
  • · Replies 10 ·
Replies
10
Views
4K
  • · Replies 11 ·
Replies
11
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 47 ·
2
Replies
47
Views
5K
  • · Replies 88 ·
3
Replies
88
Views
3K