1. Energy Energy – The ability to do work. The sun is going to die!! Oh No!! (in 5,000,000,000 years)

2. Mechanical Energy Total energy of motion and position of an object. Total energy of motion and position of an object. It can be all potential energy, all kinetic energy, or some of both. It can be all potential energy, all kinetic energy, or some of both.

3. Kinetic Energy The energy of motion The energy of motion

4. Potential Energy – The stored energy that result from the position or shape of an object. Elastic potential energy –The potential energy associated with objects that can be compressed or stretched. Elastic potential energy –The potential energy associated with objects that can be compressed or stretched. Gravitational potential energy – Potential energy related to an objects height. Weight x Height Gravitational potential energy – Potential energy related to an objects height. Weight x Height

5. There are 6 Forms of Energy 1) Mechanical a) Kinetic energy- energy of a moving object. ex.- rock rolling down a hill. kinetic energy = 1/2 mv2 example; a 20 kg goat ran at 3 m/s. 20kg x (3m/s) 2 = 20kg x 9 m/s2 = 180 = 90 J 22 2 –b) Potential Energy- “possible” energy that an object has because of its position-. ex- rock on top of a hill. Potential energy= mass x gravity x height ( g=9.8 m/s/s) Example: a 40 kg skateboarder is on a 2m ramp. 40 kg x 9.8 m/s/s x 2m = 784 J

6. 2) Chemical energy- Potential energy stored in the chemical bonds that hold molecules together. Chemical energy is stored in food, fossil fuels (gasoline, oil, coal), batteries, and wood and cells in our bodies. 2) Chemical energy- Potential energy stored in the chemical bonds that hold molecules together. Chemical energy is stored in food, fossil fuels (gasoline, oil, coal), batteries, and wood and cells in our bodies.

7. 3) Electrical energy- Energy of moving electrons. It is often an “in- between” form between 2 other forms of energy. Can be kinetic or potential Examples- electric heater, blender. Examples- electric heater, blender. power plant (burns coal) →→ power lines →→→ blender (chemical- thermal) (electrical) (kinetic) (chemical- thermal) (electrical) (kinetic)

8. 4) Electromagnetic ( or radiant) energy: The energy of waves.

9. Red orange, yellow, green blue indigo violet Visible light is only 1/1000 th of the electromagnetic spectrum.

10. Thermal Energy Thermal energy is the total potential and kinetic energy of particles in an object. (You should know about this already!)

11. 6) Nuclear energy- Energy locked in atoms. The energy can be released by splitting atoms (known as fission- This happens in nuclear power plants) or by combining atoms (known as fusion- happens in the sun and in nuclear bombs) Fusion Fission

12. Renewable vs. Nonrenewable energy Renewable vs. Nonrenewable energy Energy sources can be either- Energy sources can be either- 1) Renewable- The source is replenished (comes back) quickly by natural processes. Examples- wind, solar, hydropower (dams), geothermal (heat from underground), plants, trees (some), cow dung. 1) Renewable- The source is replenished (comes back) quickly by natural processes. Examples- wind, solar, hydropower (dams), geothermal (heat from underground), plants, trees (some), cow dung.

13. Non Renewable Energy Resources that cannot be replaced after they are used or can be replaced only over thousands or millions of years. Energy Resources that cannot be replaced after they are used or can be replaced only over thousands or millions of years. Fossil fuels are the most important non- renewable resources. Fossil fuels are the most important non- renewable resources.

14. 2) Nonrenewable- The source is used up and it is not replaced. 2) Nonrenewable- The source is used up and it is not replaced. Examples -fossil fuels (coal, oil, gasoline), uranium (nuclear power source), trees (some) Examples -fossil fuels (coal, oil, gasoline), uranium (nuclear power source), trees (some)