ELI5: Explain Like I'm 5

Momentum theory

Momentum theory is a way to understand how things move, like airplanes or cars. Imagine you are playing with a ball, and you throw it as hard as you can. The harder you throw it, the faster it goes, right? This is called momentum.

Now imagine the ball is actually an airplane wing, and the air around the wing is like your hand throwing the ball. When the airplane is moving really fast, the air creates a lot of momentum and goes over the wing really fast. This makes the airplane lift up into the sky.

But what happens if the airplane is not moving fast enough? The air does not create enough momentum and the airplane can’t lift up. This is why airplanes need to go really fast when they take off.

Momentum theory helps engineers design airplanes and cars that can move efficiently and safely. By understanding momentum, they can make sure that the airplane wings or car bodies are designed to create the right amount of momentum in the air or on the ground, and make sure they move smoothly and easily.

So just like how you throw a ball and it goes fast, momentum theory helps us understand how things move in the world around us, and how we can design things to move the way we want them to.