What would happen if organ systyems work together to warm up the body on a cold day

Im not sure if thats how it really works but if it did, either it would have to be very minimal to reduce overheating or it's just the bottom few layers of skin keeping the heat in while the muscles contract and retract.

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.