1. Types of Energy

2. TYPES OF ENERGY ELECTRICAL ENERGY LIGHT ENERGY SOUND ENERGY THERMAL ENERGY CHEMICAL ENERGY NUCLEAR ENERGY MECHANICAL ENERGY Each can be KINETIC ENERGY Each can be POTENTIAL ENERGY

3. ELECTRICAL ENERGY This is the energy of moving electrons. It is a very useful form of energy, because it can be converted or changed into other forms. Wherever there is current flowing, there is ELECTRICAL ENERGY.

4. LIGHT ENERGY Anything LUMINOUS gives off LIGHT ENERGY. Some you can’t see from the EMS. The energy produced by the vibration of electrically charged particles. Things like the Sun, light-bulbs and candles give off light.

5. SOUND ENERGY Anything noisy (like you!) gives off SOUND ENERGY by vibrations. Eg. Vocal chords, speakers and musical instruments.

6. THERMAL (HEAT) ENERGY Everything has some heat energy – even blocks of ice! The hotter something is, the more THERMAL ENERGY it has. (the kinetic energy of moving particles.)

7. CHEMICAL ENERGY When chemical bonds are broken they can release energy. The energy stored in these chemical bonds is called CHEMICAL ENERGY eg.food, fuels and batteries.

8. NUCLEAR ENERGY Energy is stored in the nucleus of atoms. When the nuclei are joined together or split apart, NUCLEAR ENERGY is released. Eg. Sun, nuclear power plants.

9. Nuclear fusion When atomic nuclei join together (fuse) it releases massive amounts of energy. Fusion happens in the sun and other stars

10. MECHANICAL ENERGY The total of both the potential and kinetic energy of an object is mechanical energy.

11. GRAVITATIONAL POTENTIAL ENERGY Anything that is above the ground has POTENTIAL ENERGY. This means that anything that can fall has GRAVITATIONAL POTENTIAL ENERGY.

12. Changes in gravitational potential energy For an object in Earth’s gravitational field: If an object falls will it gain or lose gravitational potential energy? If an object moves up will it gain or lose gravitational potential energy?

13. ELASTIC ENERGY Anything stretched has ELASTIC POTENTIAL ENERGY eg. Rubber bands, springs, knicker elastic.

14. Calculating PE GPE = mass * 9.8 m/sec² = height PE = weight height

15. KINETIC ENERGY The energy of motion…anything that moves possess kinetic energy.

16. What factors will increase the amount of kinetic energy a moving object has? The velocity of the object The shape of the object The mass of the object The height of the object

17. Calculating Kinetic Energy Kinetic energy depends on mass and speed. KE = mv² 2 What is the kinetic energy of a 20kg rock moving at speed of 10 k/sec? 20 * 100 = 2000 = 1000kg k/sec 2 2

18. What type of energy is stored in a coiled spring? A.Sound B.Kinetic C.Elastic D.Gravitational

19. What type of energy is stored in baked beans? A.Sound B.Gravitational C.Chemical D.Elastic

20. What type of energy is stored in coal, oil and natural gas? A.Light B.Heat C.Sound D.Chemical

21. Energy Conversions Change of energy from one form to another.

22. Conservation of Energy Energy cannot be created or destroyed. Friction a force that opposes the motion between 2 surfaces.