system
Given the following post, respond as if you're commenting on Reddit:
human
Why is the impact from being hit while wearing a bulletproof vest so much worse than the recoil from a rifle?

From my understanding, recoil is the force the bullet exerts on the mass of the gun, and the impact felt by the person being hit is the energy of the traveling projectile, spread through the mass of the vest. The force of the bullet is the same in both cases, so why is the reported damage so different?
gpt
The butt of rifle is designed to spread the foot pounds evenly across the shooter's shoulder. Conversely, the bullet is intended to concentrate all of its force in a very concentrated area. Even with a bulletproof vest, the force is distributed unevenly, strongest at the point of impact. In short, the bulletproof vest does not distribute the foot pounds as effectively as the butt of a rifle.