Rotation around a fixed axis

Okay kiddo, let's start with understanding what is rotation. Imagine you have a ball and you roll it from one place to another, that's called translation. However, when you spin the ball around without it going anywhere, that's called rotation.

Now, let's talk about what a fixed axis is. A fixed axis is like an imaginary line or point that an object rotates around. To help you understand, think of a carousel. The center pole that the horses go up and down on is the fixed axis, and the horses spin around it as the carousel moves.

When we talk about rotation around a fixed axis, we mean an object is spinning around this imaginary line or point without moving from its spot. Think of a spinning top, it spins around a fixed axis - its pointed end - while it stays put in one place.

That's it! So, basically, rotation around a fixed axis is when an object spins around an imaginary line or point without moving from its spot.