Why is there no torque along this axis?

In summary, Kleppner and Kolenkow discuss a gyrocompass consisting of a spinning disk and a frame supported by a horizontal axle, with the assembly rotating at a constant speed. They explain that there can be no torque along the horizontal AB axis due to the pivot, which is unable to transfer moments or torques. This is similar to the relationship between a spinning electric motor and its anchored base.
  • #1
Kashmir
465
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Kleppner and Kolenkow say "Consider a gyrocompass consisting of a balanced spinning disk a light frame supported by a horizontal axle. The assembly is turntable rotating at steady angular velocity Ω. There cannot be any torque along the horizontal AB axis because the axle is pivoted".

I'm not getting why there can be no torque along the axle due to it being pivoted ?
 

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  • #2
Because the axis is pivoted with no torque transmitted from Y shape pillars to the gyro, I assume.
 
  • #3
Pivots are unable to transfer moments or torques.
The spinning disc could apply a huge torque on the rotating plane to the horizontal axis AB, but none of it could ever reach the turnable disc.
It is exactly what happens between the spinning shaft of an electric motor and its anchored base.
 

1. Why is there no torque along this axis?

Torque is a measure of the force that causes an object to rotate around an axis. If there is no force acting on an object in a certain direction, there will be no torque along that axis.

2. Can an object have no torque along any axis?

Yes, an object can have no torque along any axis if there are no external forces acting on it or if the forces acting on it are balanced.

3. How does the location of the axis affect torque?

The location of the axis affects torque because it determines the distance between the point of application of the force and the axis of rotation. The longer the distance, the greater the torque.

4. What is the difference between torque and force?

Force is a push or pull that can cause an object to move, while torque is a measure of the force that causes an object to rotate around an axis. In other words, force causes linear motion, while torque causes rotational motion.

5. Can torque be negative?

Yes, torque can be negative. This means that the direction of the force causing the rotation is in the opposite direction of the rotation itself. Negative torque can also be referred to as "counterclockwise torque."

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