Proper velocity

Okay kiddo, do you remember that when we are walking, we move our legs and feet to go forward, and we call that our speed? It's like how fast we're going.

Well, when we talk about proper velocity, we're actually talking about how fast we're going if we were to measure our speed relative to everything else around us. This means that we're taking into account how fast other objects are moving too.

Let me give you an example. Say we're walking in a park and someone on a bike passes us. They might be going pretty fast compared to us, but if we measure our proper velocity, it would be slower than the person on the bike because they have more speed than us.

Now, let’s say we were riding on a train and someone outside the train was walking. That person would seem to be moving much slower than us because we're on a train moving much faster than they are. But if we measured our proper velocity, it would be the same as the person walking outside, because we would be measuring our own speed relative to everything inside the train.

So, proper velocity is like measuring how fast we're going while taking into account everything around us, and it could be slower or faster than other objects depending on how fast they're moving too.