Title: Rotating unbalance
Content: thin geometric profile of the disk allows for an uneven distribution of mass with an inertial axis that is nearly parallel to the axis of rotation. Only one plane receives balance correction. where U = balance, m = mass, r = distance between unbalance and the centre of the object A couple balance occurs when a rotating mass has two equal unbalance forces that are situated 180° opposite each other. A system that is statically balanced may still have a couple unbalance. Couple unbalance occurs frequently in elongated cylindrical rotors. where d = distance between the two unbalance forces along

Title: Inclination instability
Content: more time near aphelion. This torque causes the plane of the orbit to roll on its major axis. In a disk this results in the orbits rolling with respect to each other so that the orbits are no longer co-planar. The gravity of the objects now exerts forces on each other that are out of planes of their orbits. Unlike the force due to the initial perturbation these forces are in opposite directions, up and down respectively, on the inbound and outbound portions of their orbits. The resulting torque causes their orbits to rotate about their minor axes, lifting their

Title: Guiding center
Content: direction of the force is zero. There is, however, a one-time displacement in the direction of the force equal to ("f"/"m")ω, which should be considered a consequence of the polarization drift (see below) while the force is being turned on. The resulting motion is a cycloid. More generally, the superposition of a gyration and a uniform perpendicular drift is a trochoid. All drifts may be considered special cases of the force drift, although this is not always the most useful way to think about them. The obvious cases are electric and gravitational forces. The grad-B drift can be considered to

Title: Rotating unbalance
Content: Rotating unbalance Rotating unbalance is the uneven distribution of mass around an axis of rotation. A rotating mass, or rotor, is said to be out of balance when its center of mass (inertia axis) is out of alignment with the center of rotation (geometric axis). Unbalance causes a moment which gives the rotor a wobbling movement characteristic of vibration of rotating structures. A static balance (sometimes called a force balance) occurs when the inertial axis of a rotating mass is displaced from and parallel to the axis of rotation. Static unbalances can occur more frequently in disk-shaped rotors because the

Title: Force
Content: and formula_44 is the unit vector pointing in the radial direction outwards from the center. This means that the unbalanced centripetal force felt by any object is always directed toward the center of the curving path. Such forces act perpendicular to the velocity vector associated with the motion of an object, and therefore do not change the speed of the object (magnitude of the velocity), but only the direction of the velocity vector. The unbalanced force that accelerates an object can be resolved into a component that is perpendicular to the path, and one that is tangential to the path.

Question: What is an unchanging position in which forces cancel each other out?
Answer: Equilibrium