Centrifugal force is a virtual force and an inertial force, which keeps the rotating object away from its center of rotation. In Newtonian mechanics, centrifugal force is used to express two different concepts: the balance of inertial force and centripetal force observed in non-inertial reference frame. Under Lagrangian mechanics, centrifugal force is sometimes used to describe generalized forces in generalized coordinates.

Centrifugal motion refers to the phenomenon that an object is far from the center. Centrifuges in uranium enrichment plants in the United States use centrifugal motion to extract nuclear materials.

When an object is doing non-linear motion (non-Newtonian environment, such as circular motion or turning motion), because the object must have its own mass, the inertia generated by the mass will force the object to continue to move in the tangential direction of the motion trajectory (the original linear direction at that moment), instead of moving in the next turning direction.

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Centrifugal force application

The first is the meteor hammer.

Meteor hammer is a soft weapon made by tying a metal hammer to one end or both ends of a long rope, and it also belongs to the category of hidden weapons. There is only one hammer, and the rope is about five meters long, called "single meteor"; Tie two hammers, the rope is four and a half feet long, which is called "double meteor". Its hammer is melon-shaped, polygonal and round, as big as a duck egg.

There is an elephant trunk eye at the tail of the hammer for stringing together. In modern martial arts, double shooting stars are practiced, mainly by holding the middle part of the rope, performing vertical dancing, lifting flowers, one-handed flowers, chest and back flowers, waist wrapping, neck throwing and so on. The flower method is the same as stick flower and broadsword flower.

Second, the tea paradox.

The paradox of tea describes the phenomenon that tea leaves swim back to the center of the cup bottom after being stirred in the cup, rather than being pushed to the edge of the cup bottom by spiral centrifugal force as expected. The original explanation comes from a paper by Albert Einstein (1926) explaining the problem of river bank erosion (Bayer's law). Stir the liquid to make it rotate in the cup, resulting in outward centrifugal force.

The liquid near the outside of the bottom slows down due to the friction of the cup wall, where the centrifugal force is weakened, so the pressure difference has a greater effect on the water flow than the centrifugal force. This is called the boundary layer, or more precisely the Ekman layer.

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