* It depends on the play: The player with the smallest change in kinetic energy will vary drastically depending on the type of play.

* Kinetic Energy and Motion: Kinetic energy is the energy of motion. A player standing still has zero kinetic energy. A player running fast has high kinetic energy.

Here are some scenarios:

* Passing Play: The quarterback might have a relatively small change in kinetic energy if they are in the pocket. They might take a step or two but aren't moving very fast.

* Running Play: The running back will have a large change in kinetic energy, going from zero to full speed.

* Lineman: Linemen often push against each other, with some players moving back and forth. They might experience small changes in kinetic energy, or even zero change if they are locked in a stalemate.

To answer the question properly, you need more context about the specific play.

Let me know if you have a specific play in mind, and I can give you a more precise answer!