Conservation of energy (continued)
The conservation of energy is one of the most important laws in physics - One of the most important for society as well!
Energy is the engine of modern society
Conversion of energy from one form to another is the “infrastructure” of nations
- Oil to kinetic energy
- Gravity to lights in your home
- Sun’s energy to food
All uses of energy have some loss - to friction - that wind up as heat
Reducing losses (for example by thermal insulation, efficient motors, . . .) is a key goal for the future