Pöörlemistelje

Pöörlemistelje is the Estonian term for axis of rotation. It refers to an imaginary line through a rigid body around which the body rotates. This line can be located within the body or outside of it. For example, the Earth rotates around an axis that passes through its center. The axis of rotation is a fundamental concept in physics and astronomy, essential for understanding rotational motion and its effects.

When an object rotates, every point on the object, except for those on the axis itself, moves in a circular path. The speed of this circular motion is related to the distance of the point from the axis of rotation. Points farther from the axis move faster than points closer to it, assuming a constant angular velocity. The direction of the axis of rotation can be defined using the right-hand rule, where if the fingers of the right hand curl in the direction of rotation, the thumb points in the direction of the axis.

The concept of the axis of rotation is crucial in various fields. In mechanics, it helps analyze the torque and angular momentum of rotating objects. In astronomy, it's used to describe the rotation of planets, stars, and galaxies. Understanding the axis of rotation allows for the prediction of celestial movements and the analysis of astronomical phenomena.