1. What do the direction of forces between opposite charges look like?

1. + - 1. What do the direction of forces between opposite charges look like?

2. The closer they get, the stronger the repulsive force. 2. When you move two nuclei closer together, what happens to the force of repulsion between them?

3. The hair gave up electrons to the comb, so it has a positive charge, while the comb has a negative charge. Opposite charges attract. 3. Why do strands of hair move towards the comb after you comb your hair?

4. The closer the balloons get, the stronger the forces. Since the balloons have the same charge, they repel 4. When you bring two charged balloons closer to each other, what happens to the forces between them and what do they do?

5. + - 5. Label the positive and negative charges in the picture.

6. They have loosely held electrons. 6. Why are metals good conductors?

7. Movement of electrons. 7. What causes an electric current?

8. Some thing that resists the movement of electrons or heat. 8. What is an insulator?

9. Increase the voltage or decrease the resistance. 9. How can you increase the current across a resistor?

10. The circuit is broken, so there is no current. 10. If you have batteries in series, and one battery goes dead, what will happen to the current?

11. Nothing, each battery has a separate path. 11. If you have batteries in parallel, and one battery goes dead, what will happen to the current?

12. 12. Label the circuits as series or parallel. Parallel Series Series Series

13. The lamps get dimmer because the voltage is dived between the lamps. 13. In a series circuit, what happens to the brightness if you add another lamp?

14. Nothing, each lamp has a separate path to the battery, so each has the same voltage. 14. In a parallel circuit, what happens to the brightness if you add another lamp?

15. The circuit is broken, so all the lights go out. 15. In a series circuit, what happens if a lamp burns out?

16. Only that light goes out. 16. In a parallel circuit, what happens if a lamp burns out?

17. They are the same. 17. What is true about the voltage in each branch of a parallel circuit?

18. V=IR so I = V/R, R= 1/(1/2+1/4)=1.33 ohm 12 v / 1.33 ohm= 9amps. 18. If you have a 2 ohm and a 4 ohm resistor in parallel with a 12 volt battery, what is the current in the circuit?

19. V= IR so add the resistors together. V = 55 ohms times 1= 55 v 19. If you have a 10 ohm, 15 ohm and 30 ohm resistor in series, what voltage will produce a 1 amp current?

20. A transformer can increase or decrease the voltage. 20. What device can increase or decrease voltage?

21. At the poles. 21. Where is a magnetic field the strongest?

22. The warmer object transfers heat to the cooler object until both are at the same temperature. 22. When two objects of different temperature are placed together, what happens to the internal energy of both?

23. Since Kelvin is oC plus 273, 0 oC is 273 Kelvin. 23. What is the freezing point of water in Kelvin?

24. Since Kelvin is oC plus 273, 100 oC is 373 Kelvin. 24. What is the boiling point of water in Kelvin?

25. Since the mass of both water samples is the same, we can average the temperatures. 40 oC + 20 oC= 60oC, 60 / 2 = 30 oC 25. If 100 grams of water at 40 oC is mixed with 100 grams of water at 20 oC what will be the final Temperature of the water?

26. A, since the temp changes the least with the addition of heat 26. Which solid has the highest specific heat ?

27. From hot to cold. 27. Which way does heat flow?

28. That the Universe tends to move towards more disorder (randomness)and less useful energy. 28. What do the laws of Thermodynamics tell us about energy and entropy?

29. Gas, since the molecules are spread randomly. 29. Which phase has the most entropy?

30. Solid, since the molecules are arranged in a pattern. 30. Which phase has the least entropy?

31. From 40kJ to 80kJ, so 40kJ added. 31. How much heat has to be added to the substance to change it from a solid to a liquid?

32. Energy, the matter only moves in circles. 32. What does a wave carry?

33. V = ג x f So f= v/ ג 10 m/s/2 m = 5/sec or 5 Hertz 33. What is the frequency of a wave with a velocity of 10 m/s and a wavelength of 2 meters?

34. How much energy it carries. 34. What does amplitude measure in a wave?

35. A pulse. 35. A disturbance that only sends one wave is called a ….

36. V=d/t so t = d/t 1000m/ 340 m/s= 2.94 sec 36. If you are 1000 meters from a noise, how long until you hear it? (use 340 m/s for speed of sound)

37. Gamma, 37. Which part of the EM spectrum has the shortest wavelength? Gamma

38. 38. Which part of the EM spectrum has the longest wavelength? Radio Radio,

39. Parallel to the direction of the energy. 39. As a longitudinal wave passes through a medium, how do the particles of the medium move?

40. 40. Circle the part of the graph that shows the loudest sound.

41. 41. Put an x on the part of the graph that shows the quietest sound.

42. Many times faster. 42. How does the speed of a radio wave compare to the speed of sound? Speed of light 300,000,000 m/s compared to speed of sound 340 m/s.

43. The angle of incidence. 43. What does the angle of reflection equal?

44. It gets lower since it takes longer for each wave to reach you. 44. What happens to the pitch of the sound from an object moving away from you?

45. It gets higher since each wave gets to you faster than the one before. 45. What happens to the pitch of the sound from an object moving towards you?

46. Difraction. 46. What is it called when waves spread out after passing through a hole in a barrier?

47. Waves and particles. 47. Light exhibits the properties of both…..

48. 48. Which color has the shortest wavelength? Violet

49. 49. Which color has the longest wavelength? Red

50. Lens that converges (brings together) light rays. • Forms real images and virtual images depending on position of the object. In a real image the light rays intersect at the image location. 50. A convex lens produces a (virtual/real) image.