The "axis of rotation" is because when an object rotates, its points move in a circle, and the centers of these circles are on the same straight line.
- Chinese name
- Rotating shaft
- Common
- A sport
- Do everything
- Circular motion
- Role determination
- moment Algebraic sum of
Rotation is a common movement. When an object rotates, its points move in a circle. The centers of these circles are on the same line. This line is called the "axis of rotation". door 、 window 、 grinding wheel 、 Motor The rotor, etc., of is provided with a fixed shaft, which can only rotate but not move horizontally. Several forces act on the object, and their rotational action on the object is determined by their moment The algebraic sum of. If the algebraic sum of moments is equal to zero, the object will use the original angular velocity Rotate at a constant speed or keep still. 
