1. The problem statement, all variables and given/known data What happens to the internal energy of a system and its temperature when mechanical work is done on it? 2. Relevant equations ΔU=Q-W 3. The attempt at a solution First Law of Thermodynamics say:the change in internal energy of the system is equal to the heat added to the system minus the work done by the system ΔU=Q-W but what happen to the internal energy and temperature when mechanical work is done ON the system?