# Angular acceleration without rotation?

• eurekameh
In summary, angular acceleration without rotation refers to the change in angular velocity of an object without any corresponding change in its rotational axis. It is different from regular angular acceleration, which occurs while an object is rotating. Angular acceleration without rotation can be caused by external forces, changes in shape or mass distribution, or changes in the rotational axis. It can be measured using instruments such as accelerometers or gyroscopes. Real-world examples include a spinning top starting to wobble and a satellite entering or exiting the Earth's atmosphere without changing its rotational axis.
eurekameh

If rod BD is fixed at collar C, it is not rotating, correct? Why is the angular acceleration being asked if it's not rotating?

It's not fixed at collar C, it's sliding through it. It if were fixed, there would be 0 degrees of freedom, and OB could not be rotating.

it also looks like the collar can rotate at point C

This is also a kinematics problem, not an introductory physics problem, and involves using relative velocities.

Nevermind, it is rotating. Thanks!

## What is angular acceleration without rotation?

Angular acceleration without rotation refers to the change in angular velocity of an object without any corresponding change in its rotational axis. In other words, the object is not rotating, but its angular velocity is changing.

## How is angular acceleration without rotation different from regular angular acceleration?

Regular angular acceleration refers to the change in angular velocity of an object while it is rotating. Angular acceleration without rotation, on the other hand, refers to the change in angular velocity of an object that is not rotating.

## What causes angular acceleration without rotation?

Angular acceleration without rotation can be caused by various factors such as external forces acting on the object, changes in the object's shape or mass distribution, or changes in the rotational axis of the object.

## Can angular acceleration without rotation be measured?

Yes, angular acceleration without rotation can be measured using instruments such as accelerometers or gyroscopes. These instruments can detect changes in angular velocity even when there is no corresponding rotation.

## What are some real-world examples of angular acceleration without rotation?

One example of angular acceleration without rotation is the change in angular velocity of a spinning top as it starts to wobble. Another example is the change in angular velocity of a satellite as it enters or exits the Earth's atmosphere without changing its rotational axis.

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