Energy Conservation Energy cannot be destroyed or created Just changed from one form to another We say energy is conserved! True for any isolated system i. e when we put on the brakes, the kinetic energy of the car is turned into heat using friction in the brakes. The total energy of the " car-breaks-road-atmosphere" system is the same The energy of the car alone" is not conserved > It is reduced by the braking Doing "work on an otherwise isolated system will change it's energy Physics 121: Lecture 12, Pg 5Physics 121: Lecture 12, Pg 5 Energy Conservation Energy cannot be destroyed or created. Just changed from one form to another. We say energy is conserved ! True for any isolated system. i.e when we put on the brakes, the kinetic energy of the car is turned into heat using friction in the brakes. The total energy of the “car-breaks-road-atmosphere” system is the same. The energy of the car “alone” is not conserved... »It is reduced by the braking. Doing “work” on an otherwise isolated system will change it’s “energy