Rotational speed

Okay kiddo, so you know how a toy car moves when you push it, right? Well, things inside machines like cars or engines also move around to make them work. When these things move around in a circle, it's called rotational movement.

Now, imagine the toy car's wheels spinning really fast. That's kind of like what rotational speed is. It's how fast something is spinning around in a circle.

Think of a merry-go-round at the park. If it's spinning really fast, you might feel dizzy trying to keep up with it. That's because the rotational speed is high. If it's going slowly, you might not feel much at all.

In machines, things can spin at different speeds depending on what they are. For example, a fan might spin slower than a blender blade or a car engine's crankshaft.

Rotational speed is often measured in something called revolutions per minute (RPM). That tells you how many times the thing is spinning around in a minute. The faster it spins, the higher the RPM.

So, there you have it kiddo. Rotational speed is just like how fast something is spinning in a circle. Just like your toy car's wheels or the merry-go-round at the park!