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A bicyclist starts at point P and travels 200 m east to point Q. She then follows a track in the shape of a half-circle that returns her to point P. What is the magnitude of her net displacement for the entire trip? 1. 400 m 2. 200(1 + ) m 3. 200[1 + ( /2)] m 4. 200[1 + ( /4)] m 5. zero Q3.1

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A bicyclist starts at point P and travels 200 m east to point Q. She then follows a track in the shape of a half-circle that returns her to point P. What is the magnitude of her net displacement for the entire trip? A3.1 1. 400 m 2. 200(1 + ) m 3. 200[1 + ( /2)] m 4. 200[1 + ( /4)] m 5. zero

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What is the direction of the object’s average acceleration vector for the time interval from t = 0 to t = t 1 ? 1. up and to the left 2. up and to the right 3. down and to the left 4. down and to the right 5. none of the above Q3.2

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What is the direction of the object’s average acceleration vector for the time interval from t = 0 to t = t 1 ? 1. up and to the left 2. up and to the right 3. down and to the left 4. down and to the right 5. none of the above A3.2

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The motion diagram shows an object moving along a curved path at constant speed. At which of the points A, C, and E does the object have zero acceleration? 1. point A only 2. point C only 3. point E only 4. points A and C only 5. points A, C, and E Q3.3

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The motion diagram shows an object moving along a curved path at constant speed. At which of the points A, C, and E does the object have zero acceleration? 1. point A only 2. point C only 3. point E only 4. points A and C only 5. points A, C, and E A3.3

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An object moves at a constant speed in a clockwise direction around an oval track. The geometrical center of the track is at point O. When the object is at point P, which arrow shows the direction of the object’s acceleration vector? 1. arrow #1 (directly away from point O) 2. arrow #2 (perpendicular to the track) 3. arrow #3 (in the direction of motion) 4. arrow #4 (directly toward point O) 5. arrow #5 (perpendicular to the track) Q3.4

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An object moves at a constant speed in a clockwise direction around an oval track. The geometrical center of the track is at point O. When the object is at point P, which arrow shows the direction of the object’s acceleration vector? 1. arrow #1 (directly away from point O) 2. arrow #2 (perpendicular to the track) 3. arrow #3 (in the direction of motion) 4. arrow #4 (directly toward point O) 5. arrow #5 (perpendicular to the track) A3.4

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A zoo keeper fires a tranquilizer dart directly at a monkey. The monkey lets go at the same instant that the dart leaves the gun barrel. The dart reaches a maximum height P before striking the monkey. Ignore air resistance. Where is the monkey when the dart is at P? 1. point #1 (higher than point P) 2. point #2 (at the same height as point P) 3. point #3 (lower than point P) 4. not enough information given to decide Q3.5

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A zoo keeper fires a tranquilizer dart directly at a monkey. The monkey lets go at the same instant that the dart leaves the gun barrel. The dart reaches a maximum height P before striking the monkey. Ignore air resistance. Where is the monkey when the dart is at P? 1. point #1 (higher than point P) 2. point #2 (at the same height as point P) 3. point #3 (lower than point P) 4. not enough information given to decide A3.5

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A pendulum swings back and forth, reaching a maximum angle of 45° from the vertical. Which arrow shows the direction of the pendulum bob’s acceleration at Q (the low point of the motion)? 1. arrow #1 (to the left) 2. arrow #2 (straight up) 3. arrow #3 (to the right) 4. arrow #4 (straight down) 5. either arrow #1 or arrow #3, depending on the direction the bob is moving Q3.6

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A pendulum swings back and forth, reaching a maximum angle of 45° from the vertical. Which arrow shows the direction of the pendulum bob’s acceleration at Q (the low point of the motion)? 1. arrow #1 (to the left) 2. arrow #2 (straight up) 3. arrow #3 (to the right) 4. arrow #4 (straight down) 5. either arrow #1 or arrow #3, depending on the direction the bob is moving A3.6

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A pendulum swings back and forth, reaching a maximum angle of 45° from the vertical. Which arrow shows the direction of the pendulum bob’s acceleration at P (the far left point of the motion)? 1. arrow #1 (up and to the left at 45°) 2. arrow #2 (up and to the right at 45°) 3. arrow #3 (down and to the right at 45°) 4. arrow #4 (straight down) 5. arrow #5 (down and to the left at 45°) Q3.7

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A pendulum swings back and forth, reaching a maximum angle of 45° from the vertical. Which arrow shows the direction of the pendulum bob’s acceleration at P (the far left point of the motion)? 1. arrow #1 (up and to the left at 45°) 2. arrow #2 (up and to the right at 45°) 3. arrow #3 (down and to the right at 45°) 4. arrow #4 (straight down) 5. arrow #5 (down and to the left at 45°) A3.7

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