Is the pendulum of a pendulum moving in translation or rotation The sooner the better

Is the pendulum of a pendulum moving in translation or rotation The sooner the better

The pendulum of a pendulum clock rotates
The pendulum of a pendulum clock with a swing angle of less than 10 degrees can be regarded as translation, but it is not

Does the pendulum swing in translation or rotation?

Rotational motion
But when physics deduces the pendulum formula
The default pendulum is long enough and the angle is less than 15 degrees
So it can be considered as approximate translation
There are many hypotheses in physics. It depends on your understanding

About translation and rotation

Translation and rotation are for rigid bodies, so the distance between any two points of an object does not change and will not become its mirror image. The motion of a point can always be regarded as translation
Translation is the movement of an object with the same direction and distance from one point to another between any two points on the object!
It can also be defined as: translation is the motion of "the same motion" at each point on the object when the object moves
The latter definition is not very good: different initial positions can be regarded as "the same motion", but the trajectory shape and size are the same, but it is not necessarily "the same motion". For example, a ring rotates around the center of the ring, and the trajectory of each point is the same shape and size
Rotation is a movement in which the distance between each point and the same point (which can be outside the object) remains unchanged when the object is moving. It is called rotation around this point, which is called the rotation center of the object. Therefore, it does not necessarily revolve around an axis
There is a saying "both translation and rotation" in high school books. It should be clarified that "both translation and rotation" is usually "neither rotation nor translation", but it can be regarded as the superposition of the two movements
"Usually" refers to such a situation: the rotation around one point can be regarded as the result of rotation around another point plus a translation! Especially when the center of rotation is outside the object, it is often regarded as "both translation and rotation". At this time, this motion "is rotation, but not translation"
In addition, there is a common case that an object is regarded as rotating around the center of mass (or geometric center), that is, the center of rotation is often taken as the center of mass or the geometric center of the form, and if the center of mass (or geometric center) has motion, it is called "translational motion", whether it can be regarded as the object moving around another point or not

What items in life are related to technology

It can be said that it is everywhere. Except for things naturally produced in nature, anything processed and created by human beings condenses the crystallization of science and technology. For example, there are too many aspects, such as computers, cars, televisions, electric lights, high-rise buildings, clothing... Even a small nail. Without science and technology, human beings cannot complete such subtle processing and mass production

Where do you use translation and rotation in your life

I don't know what you want to ask. There are too many translations and rotations in life. Take the human body itself, the operation of each joint is a rotation, a relative rotation between bones. Translation can be regarded as translation when you skate. Anyway, there are countless. As long as you are good at discovering, since the world is three-dimensional, It must be full of such movements as translation and rotation or the movements composed of them. It's purely a personal idea. If it's not good, please laugh

Tell me about the translation and rotation phenomena in your life

Rotation in life: screw the nut with a wrench, take water from the windmill, and the wind blade of the wind turbine rotates around the shaft
Translation in life: the car moves on a straight road, moves along a straight line, pushes and pulls the switch of the window, and pushes and pulls the drawer