Changing Forms of Energy

1. Changing Forms of Energy Chapter 14

2. Energy • Energy- the ability to do work or cause a change • It can change an objects motion, color, shape, temperature, or other qualities • It cannot be created or destroyed, but can be transferred to other objects

3. Examples of Energy Transfer • A lamp changes electrical energy into light energy • Gasoline releases a chemical energy that moves a car • Other kinds of energy: Sound, light, electricity, magnetism, chemical, nuclear, mechanical, thermal

4. Kinetic and Potential Energy • Kinetic: Energy due to motion • Potential: Energy that is not causing any changes now, but could cause changes in the future • Read pages 448-451

5. http://www.youtube.com/watch?v=T5WJoup-RD8

6. Potential and Kinetic Energy • Potential • Water behind a dam • Battery • Kinetic • Water moving across turbine blades

7. A cute picture!

8. 4 Main Types of Energy • Chemical Energy • Heat Energy • Light Energy • Mechanical Energy

9. Chemical Energy • A kind of potential energy • Energy caused by chemical reactions • Examples: • Cooking food • Burning something • Batteries • Matches

10. Mechanical Energy • Mechanical energy is matter in motion. • An airplane soaring through the sky has mechanical energy just like the wind or a flowing river. • Sound is another type of mechanical energy. • Other examples: compressed springs, stretched rubber bands, bow and arrow, hammer and nail

11. Thermal (Heat) Energy • The total of all the kinetic and potential energy of the atoms in an object • When any forms of matter gets warmer, the object’s thermal energy increases

12. Thermal (Heat) Energy • Energy pushed into motion by heat • Examples: • Insulation • Refrigerators • Air conditioners • The Sun • Stove

13. Conduction, Convection, and Radiation • Read page 465 in your book

14. Conduction • The flow of heat between objects that are touching

15. Convection • The movement of warm liquids or gases to cooler areas

16. Convection

17. Radiation • The movement of energy by electromagnetic waves

19. Light Energy • Travels in waves • It is Electromagnetic Radiation – a combination of electrical and magnetic energy • Look at the pictures on page 458 & 459

20. Light Energy • Light energy comes from the Sun. Plants use it to make food and scientists use it to create lasers. • Examples: • Light bulb • Fire • The Sun • Flashlight • Firefly/Lightning bug

21. Let’s look at how lenses can bend light!

22. Concave and Convex Lenses

23. Concave Lens • Light is bent outward • Makes objects look smaller

24. Convex Lens • Bends light rays to make objects look larger • Thickest in the middle • Magnifying glass is one example

25. Here’s a short word from our friend, Bill! • http://www.youtube.com/watch?v=fD1544bM_c4

26. Major Parts of the Eye

27. Light Moving Through the Eye https://www.youtube.com/watch?v=syaQgmxb5i0

28. Light and Color • http://www.youtube.com/watch?v=AD1Xic2mn0U

37. Let your brain rest while you look at this adorable walrus!

38. http://studyjams.scholastic.com/studyjams/jams/science/matter/energy-and-matter.htmhttp://studyjams.scholastic.com/studyjams/jams/science/matter/energy-and-matter.htm

39. Energy • http://www.youtube.com/watch?v=btLU2lb3-xs

40. Sound Energy • Sound is a wave of vibrations that spreads from its source • Frequency- how fast particles are vibrating • Read page 454 and 455 to yourself • How does your ear work? • http://www.youtube.com/watch?v=HMXoHKwWmU8

41. Sound Energy http://www.youtube.com/watch?v=lTetdgpu7MU

42. Now, Let’s Look at a Cute Picture!