1. SCIENCE 8 TOPIC 4

2. What is Energy?

3. Energy is defined as the capacity to do work

4. When You “See” Energy, What Do You Really See?

5. The Radiometer

6. You are really only seeing the change that is taking place

7. The Two Forms of Energy

8. Kinetic energy is the energy of a moving body
Potential energy is the energy stored in a position or state

9. What Determines the Amount of Electromagnetic energy given off by an object?

10. THE OBJECT’STEMPERATURE

11. What Are Five Types of Electromagnetic Energy

12. Five Types of Electromagnetic Energy

13. The Spectroscope Lab

14. What is the Difference Between one form of EE and another?

15. Their wavelength differences measured crest to crest

16. What Are the Five Things that can Happen when EE comes in Contact with a Material?

17. The waves can be refracted – their direction changed as they pass through
REFRACTION

18. The waves can be reflected – bounced back
REFLECT ION

19. The waves can be scattered – both refracted and reflected in different directions

20. The waves can be absorbed – energy is taken in by the material
ABSORPTION

21. The waves can be transmitted – energy goes right through the material unchanged
TRANSMISSION

22. What is Conduction?

23. Conduction is the transfer of energy atom to atom via collisions

24. What is Convection?

25. The Teabag Demo
Watch very carefully

26. Convection is the transfer of energy in a liquid or a gas on the basis of density differences. The densities are different due to the difference of temperatures.

27. What is the Difference Between Temperature and Heat?

28. Temperature is the measurement of the average kinetic energy of a substance
Heat is the energy flow from a hotter area (the source of the energy) to a colder area (the sink where the energy flows to)

29. The Conduction Lab
OUCH!

30. The Law of Conservation of Energy

31. In a closed system, where new energy can neither enter or leave, the amount of heat lost by the source is equal to the amount gained by the sink

32. What is a Calorie?

33. A calorie is the amount of heat energy needed to raise 1 gram of water 1 degree Celsius

34. What is Specific Heat?

35. Specific heat is the amount of calories needed to raise 1 gram of any substance 1 degree Celsius

36. What is Latent Heat?

37. The potential energy gained or lost during a change of state
What is Latent Heat?
The potential energy gained or lost during a change of state

38. The Effect of Melting Icebergs on the Environment?

39. The Effect of the Evaporation of Ocean Water