2. Types of Energy Y7 Environmental Project GEL 2007

3. QUESTION? What do we need to move? E N E R G Y Where do we get this energy from? F O O D

4. would happen without In fact ….. NOTHING ENERGY

5. What is Energy? Energy is the ability to cause change! Any type of activity will require some type of energy Energy is either absorbed (taken in) or emitted (given off) during a physical or chemical change. Some Examples are: Heat, Sound, Light, Chemical, Electrical, Solar, Mechanical (motion) Most of the energy found on earth is due to the influence of our sun!

6. Energy is always in a flux… Meaning it is always changing from one form to another. This is an important law of nature called: “Law of Conservation of Energy” ~ “You cannot create or destroy energy”

7. Mechanical ENERGY ELECTRICAL ENERGY SOUND ENERGYHEAT & LIGHT ENERGY ENERGY IN ACTION: Kinetic

8. STORED ENERGY: Potential GRAVITATIONAL ENERGY CHEMICAL ENERGY STRAIN ENERGYNUCLEAR ENERGY

9. Quiz yourself: What type of energy is the following? 1. Using a saw to cut a piece of wood in half. 2. The explosion of fireworks. 3. The melting of an ice cube. 4. The glow of fluorescent light. 5. Boiling water on a stove. 6. Dropping a glass beaker onto the floor. 7. The sun’s rays

10. Answers for Kinds of Energy 1.Mechanical, Sound, 2. Chemical, Heat, Light, Sound, 3. Heat, Mechanical 4. Heat, Light, electrical 5. Heat, light, (electrical or chemical for stove ) 6. Gravitational to Mechanical, Sound 7. Solar, Heat, Light, Nuclear

11. Moving Molecules and Thermodynamics Thermal (or Heat) energy can be either taken in or given off from substances. The amount of energy that is added or removed changes the molecular motion. As you have learned, the molecules speed determines the phase of Matter. Solids are slower/fixed; Gases are rapid; Liquids are in between: medium speed.

12. What happens if you increase molecules in motion? If you continually increase the motion of a solid, what happens to it? It will eventually become a liquid. If you continually increase the motion of a liquid, what happens to it? It will eventually become a gas.

13. Cool Hot

14. TemperatureTemperature Speed of particles Bell Ringer: Draw the following graph and put what line you think needs to be in the graph.

15. Group Lab Answers: 1.Flashlight: chemical energy (from the battery) to light and heat energy 2.Food Clock: chemical energy (from the fruit) to the electrodes that powers the clock (electrical energy) 3.Newton’s Cradle: gravitational potential energy when it is up high to mechanical energy for the motion of the metal balls 4.Solar Cricket: A solar panel collect light energy transfers it to a wire (electric energy) & vibrates the cricket (mechanical energy)

16. Group Lab Answers: 5. Heat Sensor: a thermometer picks up the heat energy in the substance through metal’s property of conductivity. 6. The electric pencil sharpener: gets electrical energy when plugged in and converts to mechanical energy that powers the metal blades. 7. Rubber band: the rubber band can stretch and gain strain energy and when released goes to mechanical energy. 8. Radiometer: the white and black panels transfer photons (solar particles: light/solar energy) which powers the pinwheel inside to rotate around and around (mechanical energy)