Newtonianism is a way of understanding motion and how things move. Imagine playing with a ball. When you kick the ball, it will move in a certain direction. Newtonianism helps us understand why the ball moves the way it does.
According to Newtonianism, everything that moves (or doesn't move) has what is called a "force" that is acting on it. A force is like a push or a pull. The force can be really big, like a car pushing a truck, or really small, like a book resting on a table.
Newtonianism also talks about things called "laws." Laws are like rules that help us understand how things move. One important law is called the "law of inertia." This law tells us that things will keep doing what they are doing unless something else makes them change. So, if the ball is rolling, it will keep rolling unless something stops it, like a wall.
Another law is called the "law of action and reaction." This law tells us that for every action, there is an equal and opposite reaction. This means that when you kick the ball, the force of your foot pushing the ball is balanced by the force of the ball pushing back on your foot. That's why you feel a little "kickback" when you kick the ball.
Overall, Newtonianism helps us understand why things move the way they do and helps us make predictions about how things will move in the future. It's like having a magic crystal ball that lets us see into the future of motion!