1. Conservation of Energy Notes

2. Learning Targets I can state the law of conservation of energy I can define the two categories of energy I can determine the amounts of each energy present at different times in an object’s motion.

3. Energy Energy is the ability to do work (produce change) – Light a light bulb – Heat something up – Move something – Cause pain

4. Two Phases of Energy Kinetic energy– energy of motion Potential energy—stored energy

5. Conservation of Energy ENERGY CANNOT BE CREATED OR DESTROYED, ONLY TRANSFERRED BETWEEN TYPES OF ENERGY The total amount of energy in a system remains constant

6. Pendulum Example Gravitational Motion Gravitational Motion Gravitational Motion Gravitational Motion Gravitational Motion

7. Energy Graphs As grav. increases, motion decreases As grav decreases, motion increases The TOTAL (sum) energy stays constant Grav PE Motion KE Total Energy

8. Ball bounce Example Gravitational Motion Elastic Thermal Gravitational Motion Elastic Thermal Gravitational Motion Elastic Thermal Gravitational Motion Elastic Thermal Gravitational Motion Elastic Thermal

9. Summary Energy has two phases: Kinetic and Potential When one form of energy decreases, another must increase to keep the TOTAL energy constant Energy is never created or destroyed, but can be transferred into different forms