Table of Contents

## What is gyroscopic force?

Gyroscopic motion is the tendency of a rotating object to maintain the orientation of its rotation. The object will resist any change in its axis of rotation, as a change in orientation will result in a change in angular momentum.

**What is angular momentum and torque?**

The total angular momentum is the sum of the spin and orbital angular momenta. Torque can be defined as the rate of change of angular momentum, analogous to force.

**What is forced precession?**

If the axis of a spinning gyroscope is inclined to the vertical, its axis generates in space a circular cone, so that the angle between the axis and the vertical remains constant during rotation. This kind of motion of a gyroscope that is subjected to an external torque is called forced or torque-induced precession.

### What is precession in a gyro?

Precession describes a change in the direction of the axis of a rotating object, so in this case a change in the spin axis of the gyroscope.

**What is inertia force and inertia torque?**

When a torque is applied to an object it begins to rotate with an acceleration inversely proportional to its moment of inertia. The moment of inertia is the rotational mass and the torque is rotational force.

**Is spin angular momentum?**

“Spin is the total angular momentum, or intrinsic angular momentum, of a body. The spins of elementary particles are analogous to the spins of macroscopic bodies. In fact, the spin of a planet is the sum of the spins and the orbital angular momenta of all its elementary particles.

## What is spin precession?

precession, phenomenon associated with the action of a gyroscope or a spinning top and consisting of a comparatively slow rotation of the axis of rotation of a spinning body about a line intersecting the spin axis. The smooth, slow circling of a spinning top is precession, the uneven wobbling is nutation.

**Why does a cylinder have an upward force?**

The net turning of the flow has produced an upward force. Because of the change to the velocity field, the pressure field will also be altered around the cylinder. The magnitude of the force can be computed by integrating the surface pressure times the area around the cylinder.

**What happens when a rotating cylinder rotates clockwise?**

The cylinder rotates clockwise. So the free stream flow over the top of the cylinder is assisted by the induced flow; the free stream flow below the cylinder is opposed by the induced flow. The streamlines around the cylinder are distorted because of the spinning. If the cylinder were not spinning, the streamlines would be symmetric top and bottom.

### How is the lift of a rotating cylinder determined?

The equation states that the lift L per unit length along the cylinder is directly proportional to the velocity V of the flow, the density r of the flow, and the strength of the vortex G that is established by the rotation. The equation gives lift-per-unit length because the flow is two dimensional.

**How does a rotating cylinder create a vortex?**

If we put a cylinder that is rotating about the longitudinal axis (a line perpendicular to the circular cross section) into a fluid, it would eventually create a spinning, vortex-like flow around the cylinder. If we then set the fluid in motion, the uniform velocity flow field can be added to the vortex flow.