Linked Questions

3 votes
3 answers
2k views

Can an object rotate about two axes at once? [duplicate]

I recall from a course on classical dynamics that angular velocity is a 3-dimensional vector, and angular velocity can be added and subtracted. From this, my understanding is that an object can "...
Sam Jaques's user avatar
  • 1,327
1 vote
3 answers
507 views

How can a body have two axis of rotation at the same time? [duplicate]

I m not concerned with rotation of a body with two simultaneous axis but concerned with how we choose the axis,while going through pure rolling I have observed that there are two axis of rotation one ...
sachin's user avatar
  • 356
0 votes
0 answers
100 views

Can an object have more than one axes of rotation? [duplicate]

A few answers I found say "no." Perhaps because the conditions for rotation around multiple axes have not been met. However, I have seen a couple of videos of objects spinning around both ...
RobotMan's user avatar
39 votes
4 answers
41k views

Stability of rotation of a rectangular prism

I've noticed something curious about the rotation of a rectangular prism. If I take a box with height $\neq$ width $\neq$ depth and flip it into the air around different axes of rotation, some motions ...
Kyle Oman's user avatar
  • 18.5k
48 votes
1 answer
5k views

Why does this object periodically turn itself?

See below gif image taken from here. Or see this Youtube video about 30 sec in. Is this a real effect? Why does it seem to turn periodically? Can it be explained by classical mechanics alone? Is ...
pacó's user avatar
  • 515
11 votes
4 answers
5k views

How many different axes of rotation can coexist?

I have questions about rotation. There is a sphere in space. I can apply a force to cause the sphere to rotate around a central axis. An infinite number of possible central axes can be drawn. ...
Willk's user avatar
  • 351
11 votes
4 answers
8k views

Which is the axis of rotation?

This should be simple, but it keeps bothering me. If a rigid body has no fixed axis, and a torque (defined relative to a point $A$) is applied, it will rotate around $A$. But often I can also ...
yarnamc's user avatar
  • 1,231
17 votes
1 answer
5k views

Why does a cuboid spin stably around two axes but not the third?

Let $C$ be a cuboid (rectangular parallelepiped) with edges of lengths $a < b < c$. Consider an axis that passes through the centers of two opposite faces of $C$. There are three such axes, ...
Mark Dominus's user avatar
  • 2,698
1 vote
1 answer
1k views

Understanding Euler's rotation theorem

According to Euler's rotation theorem, simultaneous rotation along a number of stationary axes at the same time is impossible. If two rotations are forced at the same time, a new axis of rotation will ...
Subhranil Sinha's user avatar
5 votes
1 answer
788 views

Why can we use just one angular velocity vector to describe the rotation of a whole non-inertial reference frame?

The other day in class the professor was explaining non-inertial reference frames. We were working out how to find the acceleration of a point as measured from the non-inertial reference frame, and ...
Javier's user avatar
  • 28.3k
-2 votes
3 answers
527 views

Can a rigid body have three independent rotations, about three different, mutually perpendicular axes?

It appears that this is kinematically possible, but it looks quite unprobable. For example, it is quite improbable for a sphere to have rotation about three mutually perpendicular axes (supposedly ...
Shubham's user avatar
  • 432
0 votes
1 answer
560 views

Can any object or thing spin in two directions at once? [closed]

Can anything spin in two directions at once, separately? If so, how? For instance, could an object spin sideways and up and down at the same time, separately?
Max's user avatar
  • 383
2 votes
2 answers
407 views

Can a rotating body have two instantaneous axis of rotation at a particular instant?

I was solving a question where a disc was placed between two plates which were given velocities $V1$ and $V2$ and was asked to find radius of curvature at a point P on the disc. It was mentioned that ...
Aman Nambisan's user avatar
0 votes
1 answer
76 views

Conceptual Question About Gyroscopic Precession of body about Two Axes

I've been trying to glean some insight into the motion of a body that is rotating about an axis through the COM of said body whilst traveling in a orbital-like path about a perpendicular axis outside ...
david MITCHELL's user avatar
0 votes
1 answer
19 views

Calculating Rotations Associated with Circular Motion

Suppose a motorcyclist is driving at constant speed along a circular track and, suppose further, that a local coordinate system is associated with the motorcycle, where $x$ is tangent to the circle ...
Manfred Weis's user avatar