Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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Figure
11-1
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1.
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Examine Figure 11-1. If you were standing under the tree, which object would
appear to be moving?
a. | the tree | c. | the boy | b. | the airplane | d. | the building |
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2.
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A passenger in the rear seat of a car moving at a steady speed is at rest
relative to
a. | the side of the road. | c. | the front seat of the car. | b. | a pedestrian on the
corner ahead. | d. | the wheels of
the car. |
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3.
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Which distance can be most accurately measured with a ruler?
a. | the length of a river | b. | the width of a book | c. | the distance between
two cities | d. | the size of an object under a microscope |
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4.
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One kilometer equals 1000 meters. What does the prefix kilo- mean?
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5.
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A person walks 1 mile every day for exercise, leaving her front porch at 9:00
am. and returning to her front porch at 9:25 am. What is the total displacement of her daily
walk?
a. | 1 mile | c. | 25 minutes | b. | 0 | d. | none of the
above |
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6.
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A person drives north 6 blocks, then turns west, and drives 6 blocks. The driver
then turns south and drives 6 blocks. How could the driver have made the distance shorter while
maintaining the same displacement?
a. | by driving west 6 blocks from the starting point | b. | by driving north 4
block and west 7 blocks | c. | by driving south 6 blocks from the starting
point | d. | by driving back to the starting point by the same
route |
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7.
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A ball is rolled uphill a distance of 5 meters before it slows, stops, and
begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is
the magnitude of the ball’s displacement?
a. | 4 meters | c. | 14 meters | b. | 9 meters | d. | 45 meters |
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8.
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Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north
combine to a total displacement of
a. | 16 km north | c. | 6 km south | b. | 11 km west | d. | 2 km south |
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9.
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What is the most appropriate SI unit to express the speed of a cyclist in the
last leg of a 10-km race?
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10.
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Speed is the ratio of the distance an object moves to
a. | the amount of time needed to travel the distance. | b. | the direction the
object moves. | c. | the displacement of the object. | d. | the motion of the
object. |
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11.
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Instantaneous speed is measured
a. | at the starting point. | b. | when the object reaches its
destination. | c. | at a particular instant. | d. | over the duration of the
trip. |
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12.
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A car traveled 60 km in 2 hours, 84 km in the next 1 hour, and then 68 km in 2
hours before reaching its destination. What was the car’s average speed?
a. | 212 km/h | c. | 148 km/h | b. | 42 km/h | d. | 1060 km/h |
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13.
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The slope of a line on a distance-time graph is
a. | distance. | c. | speed. | b. | time. | d. | displacement. |
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14.
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A horizontal line on a distance-time graph means the object is
a. | moving at a constant speed. | c. | slowing down. | b. | moving
faster. | d. | at
rest. |
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15.
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What is the speed of a bobsled whose distance-time graph indicates that it
traveled 100 m in 25 s?
a. | 4 m/s | c. | 0.25 mph | b. | 2500 m/s | d. | 100 m/s |
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16.
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A distance-time graph indicates that an object moves 100 m in 4 s and then
remains at rest for 6 s. What is the average speed of the object?
a. | 50 m/s | c. | 10 m/s | b. | 25 m/s | d. | 100 m/s |
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17.
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A river current has a velocity of 5 km/h relative to the shore, and a boat moves
in the same direction as the current at 5 km/h relative to the river. How can the velocity of the
boat relative to the shore be calculated?
a. | by subtracting the river current vector from the boat’s velocity
vector | b. | by dividing the river current vector by the boat’s velocity
vector | c. | by multiplying the vectors | d. | by adding the
vectors |
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18.
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Vector addition is used when motion involves
a. | more than one direction. | c. | more than one
speed. | b. | more than one velocity. | d. | all of the above |
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19.
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The rate at which velocity changes is called
a. | speed. | c. | acceleration. | b. | vectors. | d. | motion. |
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20.
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Which example identifies a change in motion that produces acceleration?
a. | a speed skater moving at a constant speed on a straight track | b. | a ball moving at a
constant speed around a circular track | c. | a particle moving in a vacuum at constant
velocity | d. | a vehicle moving down the street at a steady speed |
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21.
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Objects in free fall near the surface of the Earth experience
a. | constant speed. | c. | constant acceleration. | b. | constant
velocity. | d. | constant
distance. |
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22.
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Which example describes constant acceleration due ONLY to a change in
direction?
a. | increasing speed while traveling around a curve | b. | an object at
rest | c. | traveling around a circular track | d. | an object in free
fall |
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23.
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Suppose you increase your walking speed from 1 m/s to 3 m/s in a period of 1 s.
What is your acceleration?
a. | 2 m/s2 | c. | 4 m/s2 | b. | 5 m/s2 | d. | 3
m/s2 |
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24.
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An object moving at 30 m/s takes 5 s to come to a stop. What is the
object’s acceleration?
a. | 30 m/s2 | c. | –6 m/s2 | b. | –30
m/s2 | d. | 6
m/s2 |
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25.
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The slope of a speed-time graph indicates
a. | direction. | c. | velocity. | b. | acceleration. | d. | speed. |
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