Third order

Okay kiddo, imagine you have a toy car, and you want to know how fast it can go. To figure that out, you can measure how long it takes for the car to travel a certain distance, and use that information to calculate its speed.

But what if you want to know how quickly the car is speeding up or slowing down? This is where something called "acceleration" comes in. It basically means how much an object's speed is changing over time.

Now, imagine you want to know how quickly the car's acceleration is changing over time. This is where the concept of a "third order" comes in. It means we're looking at the rate of change of the rate of change of the car's speed.

It might sound a bit tricky, but it's basically just a way of measuring how the car's acceleration is changing over time. And this is really useful for things like predicting how long it will take the car to come to a stop, or how fast it will be going at any given moment.

So, in short, "third order" just means we're looking at how quickly the rate of acceleration is changing over time. It's kind of like measuring how quickly your toy car is speeding up or slowing down even faster than you would normally do!