Rotating reference frames are characterized by three fictitious forces

Rotating molds are used and the molten material is added and shaped by centrifugal forces.

Rotating molecules push, pull, and collide with other molecules ( through electrical forces ), distributing the energy to adjacent molecules and atoms in the material.

Rotating officers also promotes cross-training in a wider variety of skills, and serves to prevent " cliques " that can contribute to corruption or other unethical behavior.

Rotating diffusers — which destroys the spatial coherence of the laser light — can also be used to reduce the speckle.

Rotating devices such as centrifuges used in astronaut training and amusement park rides such as the Rotor, Mission: Space and the Gravitron can cause motion sickness in many people.

However, despite the heavy fragmentation, Mohist diligence and attention to details which set Mo Jing apart from other works ensured that the highly descriptive details of the workings of mechanical devices like Cloud Ladders, Rotating Arcuballistas and Levered Catapults, records of siege techniques and usage of siege weaponry can still be found today.

* Crop rotation: Rotating crops with ones that kill weeds by choking them out, such as hemp, Mucuna pruriens, and other crops, can be a very effective method of weed control.

Maharishi University of Management has a program known as the " Rotating University ", in which students can take courses of study abroad, usually of 4 – 6 weeks duration, in the one-course-at-a-time format.

Rotating fan blades, particularly aluminum ones, can also demonstrate the effect ; as the fan accelerates or decelerates, the colors appear, drift, change and disappear.

Rotating objects can appear stationary under strobe light, also they can appear to be counter-rotating.

Rotating tethers can also be used to slow down incoming spacecraft, thus increasing the rotational momentum.

Rotating the blade on the strop about the cutting edge can damage it because such use will impact the micro-alignment of the edge.

* Rotating electrode: can the instrument operate a rotating electrode.

* Bresnan cellar nozzle: Rotating nozzle tip having two or more outlets forming water jets that propel the tip while spraying water in a circular pattern ; conveniently attached to several feet ( a meter ) of rigid pipe with handles or legs for supporting the nozzle while it is suspended through a hole in the floor above.

Rotating a handle on the side of the reel rotates the spool which retrieves the line, usually at a 1: 1 ratio ( i. e., one complete revolution of the handle equals one revolution of the spool ).

Rotating one cylinder relative to the other from this state results in a restoring torque.

Rotating the coil in one direction or the other away from the center position will increase or decrease voltage in the secondary movable coil.

Rotating in one direction, the saw teeth of the drive disc lock with the teeth of the driven disc, making it rotate at the same speed.

Rotating in one direction, the rollers lock with the cylinder making it rotate in unison.

Rotating one of the pentagonal rotundae ( J < sub > 6 </ sub >) through 36 degrees before inserting the prism yields an elongated pentagonal orthobirotunda ( J < sub > 42 </ sub >).

Rotating one of the pentagonal rotundae ( J < sub > 6 </ sub >) through 36 degrees before inserting the prism yields the elongated pentagonal gyrobirotunda ( J < sub > 43 </ sub >).

Rotating one of the cupolae through 36 degrees before inserting the prism yields an elongated pentagonal gyrobicupola ( J < sub > 39 </ sub >).

Rotating one of the pentagonal cupolae ( J < sub > 5 </ sub >) through 36 degrees before inserting the prism yields an elongated pentagonal orthobicupola ( J < sub > 38 </ sub >).

Rotating one of the cupolae through 60 degrees before the elongation yields the triangular orthobicupola ( J < sub > 35 </ sub >).

Rotating a vector through an angle of θ corresponds to, so that the corresponding action on spinors is via.

* Rotating reference frame

Rotating reference frame | Rotating-frame depiction of the horseshoe orbit s of Janus and Epimetheus

Supposing the bodies tied by a rope to hold them together ( rather than gravity, which is ignored in this example ), the rope is under tension if the bodies are rotating relative to absolute space ( according to Rotating spheres | Newton ), or because they rotate relative to the Universe itself ( according to Mach's principle | Mach ), or because they rotate relative to an inertial frame of reference according to modern ideas.

* Rotating reference frame

# redirect Rotating reference frame

The following example shows the structure of the animation file Rotating earth ( large ). gif shown ( as a thumbnail ) at the top of the article.

It is the shape of the parabolic reflectors used in mirrors, antenna dishes, and the like ; and is also the shape of the surface of a rotating liquid, a principle used in liquid mirror telescopes and in making solid telescope mirrors ( see Rotating furnace ).

In other systems, people for a Rotating Savings and Credit Association or ROSCA to purchase costly material together ( such as Tontines and Susu accounts ).

CERES operates in three scanning modes: across the satellite ground track ( cross-track ), along the direction of the satellite ground track ( along-track ), and in a Rotating Azimuth Plane ( RAP ).

Rotating the coordinates so that the second basis vector points in the direction of the Higgs boson makes the vacuum expectation value of H the spinor ( 0, v ).

* Rotating the sheet by ten degrees around some marked point ( which remains motionless ).

* R. Emms, Medieval Rotating Column-Indicators, Transactions of the Cambridge Bibliographical Society, XII, 2001, 179 – l-84 ).

Analysis of motion within rotating frames can be greatly simplified by the use of the fictitious forces.

Concepts of centripetal and centrifugal force played a key early role in establishing the set of inertial frames of reference and the significance of fictitious forces, even aiding in the development of general relativity in which gravity itself becomes a fictitious force.

Another example of a fictitious force associated with rotating reference frames is the centrifugal force.

In contrast, in frames accelerating with respect to the fixed stars, an important case being frames rotating relative to the fixed stars, the laws of motion did not hold in their simplest form, but had to be supplemented by the addition of fictitious forces, for example, the Coriolis force and the centrifugal force.

On the basis of universality of physical law and the request for frames where the laws are most simply expressed, inertial frames are distinguished by the absence of such fictitious forces.

The role of fictitious forces in classifying reference frames is pursued further below.

Inertial and non-inertial reference frames can be distinguished by the absence or presence of fictitious forces, as explained shortly.

Bodies in non-inertial reference frames are subject to so-called fictitious forces ( pseudo-forces ); that is, forces that result from the acceleration of the reference frame itself and not from any physical force acting on the body.

Examples of fictitious forces are the centrifugal force and the Coriolis force in rotating reference frames.

This is a fictitious force: it only arises when calculations or experiments are conducted in non-inertial frames of reference, such as the surface of the Earth.

In contrast, in frames accelerating with respect to the fixed stars, in particular frames rotating relative to the fixed stars, the laws of motion did not hold in their simplest form, but had to be supplemented by the addition of fictitious forces, for example, the Coriolis force and the centrifugal force.

However, four fictitious forces are defined for frames accelerated in commonly occurring ways: one caused by any relative acceleration of the origin in a straight line ( rectilinear acceleration ), two caused by any rotation ( centrifugal force and Coriolis force ) and a fourth, called the Euler force, caused by a variable rate of rotation, should that occur.

The physical explanation of motions in an inertial frames is the simplest possible, requiring no fictitious forces: fictitious forces are zero, providing a means to distinguish inertial frames from others.

The centrifugal force is sometimes called a fictitious force or pseudo force, to underscore the fact that such a force only appears when calculations or measurements are conducted in non-inertial reference frames.

All non-inertial reference frames exhibit fictitious forces.

Using these accelerations a comparison of Newton's second law as formulated in the frames identifies the fictitious forces.