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Chapter III: Answers to the2009 AP Physics B Exam

Item

No.

Correct

Answer

Percent Correct by Score TotalPercent

Correct5 4 3 2 1

26 D 93 82 66 45 24 60

27 C 85 75 66 53 41 62

28 C 89 77 63 48 27 58

29 A 88 70 54 39 24 52

30 C 79 52 31 19 14 36

31 C 89 77 64 51 34 61

32 B 90 78 62 44 25 58

33 A 84 61 44 40 34 50

34 A 98 93 78 54 26 68

35 A 83 61 37 19 13 39

  36* – – – – – – –

37 E 72 49 32 19 10 33

38 E 59 34 16 7 5 21

39 C 86 75 64 55 42 63

40 A 96 89 76 56 26 66

41 E 81 65 50 38 21 49

42 A 82 62 38 19 10 39

43 B 87 68 47 28 18 47

44 A 91 80 64 43 21 58

45 D 94 85 70 49 22 62

46 B 79 50 29 19 13 35

47 C 40 28 24 23 22 27

48 B 41 23 17 15 14 20

49 A 38 26 20 15 11 21

50 E 60 49 43 35 21 40

continued on next page

  Section I: Multiple Choice Section I Answer Key and Percent Answering

Correctly  Analyzing Your Students’ Performance on the

Multiple-Choice Section Diagnostic Guide for the 2009 AP Physics B Exam

  Section II: Free Response Comments from the Chief Reader Scoring Guidelines, Sample Student Responses,

and Commentary 

Section I: Multiple Choice

Listed below are the correct answers to the multiple-choice

questions, the percent of AP students who answered eachquestion correctly by AP score, and the total percent

answering correctly.

Item

No.

Correct

Answer

Percent Correct by Score TotalPercentCorrect5 4 3 2 1

1 B 98 95 92 88 79 90

2 B 91 68 40 19 12 42

3 E 98 90 74 47 18 63

4 E 99 93 80 60 34 71

5 C 97 92 82 69 48 76

6 D 92 83 71 57 36 66

7 B 96 90 83 75 55 78

8 E 76 70 63 57 46 61

9 C 88 81 70 55 31 63

10 C 46 35 31 23 15 29

11 D 88 69 49 35 30 52

12 C 83 73 63 52 38 60

13 D 83 55 31 17 10 36

14 D 89 75 61 51 39 61

15 C 80 67 59 53 45 59

16 E 90 79 64 46 26 59

17 D 90 77 56 33 12 51

18 C 61 43 32 22 15 33

19 D 23 25 23 20 14 21

20 D 86 65 42 24 12 42

21 E 77 65 50 33 16 46

22 E 84 68 52 37 20 50

23 C 66 51 43 39 32 45

24 D 63 38 25 17 12 29

25 C 92 82 69 57 37 65

Section I Answer Key and Percent Answering Correctly

*Although 70 multiple-choice items were administered in Section I, item #36was not used in scoring.

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52

Item

No.

Correct

Answer

Percent Correct by Score TotalPercent

Correct5 4 3 2 1

51 E 94 75 49 23 9 47

52 D 75 54 37 24 15 38

53 B 89 71 47 24 11 45

54 A 77 57 40 26 16 41

55 C 81 58 37 23 16 40

56 A 68 46 31 23 17 35

57 E 79 60 41 26 13 41

58 B 45 23 13 9 12 18

59 A 85 63 36 18 9 39

60 B 75 52 31 19 15 35

Item

No.

Correct

Answer

Percent Correct by Score TotalPercent

Correct5 4 3 2 1

61 D 83 57 33 18 11 37

62 A 53 39 30 24 18 31

63 D 83 74 62 49 29 58

64 D 69 49 35 24 16 36

65 E 35 19 14 13 12 17

66 B 68 40 22 14 12 28

67 A 69 53 38 24 18 38

68 C 89 78 65 48 27 59

69 C 51 27 15 10 12 21

70 D 68 43 25 17 15 31

Section I Answer Key and Percent Answering Correctly (continued)

Analyzing Your Students’ Performance on

the Multiple-Choice Section

If you give your students the 2009 exam for practice, you

may want to analyze the results to find overall strengths

and weaknesses in their understanding of AP Physics B.

e following diagnostic worksheet will help you do this.

You are permitted to photocopy it and distribute it to your

students for completion.

1. In each section, students should insert a check mark for

each correct answer.

2. Add together the total number of correct answers for

each section.

3. To compare the student’s number of correct answers

for each section with the average number correct

for that section, copy the number of correct answers

to the “Number Correct” table at the end of the

Diagnostic Guide.

In addition, under each question, the percent of AP

students who answered correctly is shown, so students can

analyze their performance on individual questions.is

information will be helpful in deciding how students should

plan their study time.

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Diagnostic Guide for the 2009 AP Physics B Exam

Mechanics (Average number correct = 13.6)

Question # 1 2 3 4 5 6 7 8 9 21 22 33 34

Correct/Incorrect

Percent of Students

Answering Correctly   90 42 63 71 76 66 78 61 63 46 50 50 68

Question # 35 41 42 43 44 54 55 59 60 67 68 69 70

Correct/Incorrect

Percent of Students

Answering Correctly   39 49 39 47 58 41 40 39 35 38 59 21 31

Electricity and Magnetism (Average number correct = 6.6)

Question # 13 14 15 16 17 18 19 20 45 46 47 52 53 56 57 58

Correct/Incorrect

Percent of StudentsAnswering Correctly 

  36 61 59 59 51 33 21 42 62 35 27 38 45 35 41 18

Fluids andermal Physics (Average number correct = 4.0)

Question # 10 11 12 23 24 37 38 39 40

Correct/Incorrect

Percent of Students

Answering Correctly   29 52 60 45 29 33 21 63 66  

Waves and Optics, Atomic and Nuclear Physics (Average number correct = 7.9)

Question # 25 26 27 28 29 30 31 32 48 49 50 51 61 62 63 64 65 66

Correct/Incorrect

Percent of Students

Answering Correctly   65 60 62 58 52 36 61 58 20 21 40 47 37 31 58 36 17 28

Number Correct

Mechanics

Electricity and

Magnetism

Fluids and

ermal Physics

Waves and Optics,

Atomic and Nuclear Physics

Number of

Questions26 16 9 18

Average

Number

Correct

13.6

(52.3%)

6.6

(41.3%)

4.0

(44.4%)

7.9

(43.9%)

My Number

Correct