2. What is magnetism ? Force of attraction and repulsion

3. What causes magnetism ? The spin of electrons

4. Where is the strongest point in a magnet? The poles

5. What happens to the magnetism of a wire carrying electricity if you add more coils? It becomes stronger

6. What is the magnetic field? The space around a magnet

7. How can we create a magnet? Rub a piece of iron with a magnet in one direction Attach a piece of iron to a magnet Use electricity

8. What is the magnetosphere ? Field around the earth

9. How does the earth’s magnetic field help us? Protects us from the sun

10. Draw the north pole next to the south pole of two magnets ? they attract one another

11. Where is the electric field of a charged object the strongest? On the outside (surface) of an object

12. What charge does an object have if it doesn’t have enough electrons on it? positive

13. How do you make an electric field stronger? Take away negative or Add positive

14. Draw the electric field around two positive objects? They repel

15. What happens when two objects that have opposite charges come near each other? They attract each other

16. What is the rule of charges? Opposites attract, Same repel

17. What charge does an object have if it has too many electrons on it? Negative

18. What is the electric field? Area around a charged object

19. Draw the electric field around a negative object ?

20. What happens when two objects that have the same charge come near each other? They repel each other

21. How much current can be pushed through a 5 ohm resistor if the voltage is 10 volts? V = I x R 10 = I x 5 10/5 = 2 amps

22. What is the symbol for current?

23. What is a wet cell ? A battery that has liquid inside

24. What are the electrons doing an AC wire ? The electrons are going back and forth

25. What is the voltage in your house wiring ? 120

26. What is current? A flow of electrons

27. What is a voltage? Push of electrons

28. What is resistance? Friction to electrons moving

29. What are 3 ways to transfer heat ? Convection Conduction Radiation

30. Give an example of heat transfer by radiation ? putting your hand by your forehead

31. Give an example of heat transfer by conduction ? Pan on a burner of stove

32. Give an example of heat transfer by convection ? Hand over a radiator

33. What are insulators ? Something that slows down heat transfer

34. What is heat ? Energy of molecules in motion

35. What happens to the molecules of a liquid as heat is added to it? Molecules speed up

36. What are conductors ? Substances that allow electrons or heat to go through them (tend to be metal)

37. What happens to the molecules of a hot object if it touches a cold object? They slow down

38. Why can’t we say that heat rises ? Objects rise – not energy

39. What units is heat measured in? Joules and Calories

40. What is temperature in terms of molecules ? How fast molecules are moving

41. What do we use to measure temperature ? thermometer

42. What is the Celsius thermometer based on? Freezing = 0 degrees Boiling = 100 degrees

43. What is the Kelvin thermometer based on? The speed of molecules

44. Why can’t there be a temperature below zero degrees Kelvin? Because molecules stop at zero

45. Why do bridges have expansion joints ? To protect from cracking in hot weather and pulling apart in cold weather

46. Why is it that most materials expand when heated? Molecules move faster and further away from each other

47. Why does water expand when cooled to zero degrees Celsius? Water freezes and traps space between molecules