Types of Energy

1. Types of Energy Y7 Environmental Project GEL 2007

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

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

4. What is Energy? • Energyis 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!

5. 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”

6. ENERGY IN ACTION: Kinetic Mechanical ENERGY ELECTRICAL ENERGY SOUND ENERGY HEAT & LIGHT ENERGY

7. STORED ENERGY: Potential GRAVITATIONAL ENERGY CHEMICAL ENERGY STRAIN ENERGY NUCLEAR ENERGY

8. 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

9. 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

10. 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.

11. 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 aliquid. • If you continually increase the motion of a liquid, what happens to it? • It will eventually become a gas.

12. Cool Hot

13. Bell Ringer: Draw the following graph and put what line you think needs to be in the graph. Tempera t ure Speed of particles

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

15. 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)