Four-force

A four-force is a way that scientists talk about how things are moving around in space. It's like a special set of instructions that tell us how fast something is going and in what direction, and also how much of a push or pull is being used to make it move. It's like using a special computer program to draw a picture of an airplane in flight - you need all the right information about speed and direction and forces to get it to look just right. Without the four-force, scientists wouldn't be able to accurately describe how things are moving through space or how they're affected by different things like gravity or electromagnetic fields. So the four-force is a really important tool for understanding the way our world works!