ELI5: Explain Like I'm 5

Radiation reaction force

Radiation reaction force is like a push or a pull when something is moving really quickly. It happens when something is moving so quickly, like an airplane, that it makes a kind of noise. This noise is called radiation and it can cause a reaction force, which is like a push or a pull that affects the thing that's moving. It's like a giant hand pushing or pulling the airplane forward or backward.