Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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When
velocity is positive and acceleration is negative, what happens to the object’s
motion? a. | The object speeds
up. | c. | The object remains at
rest. | b. | Nothing happens to the object. | d. | The object slows down. | | | | |
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2.
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A dolphin
swims 1.85 km/h. How far has the dolphin traveled after 0.60 h? a. | 0.63
km | c. | 2.5
km | b. | 3.7
km | d. | 1.1
km | | | | |
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3.
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In addition
to displacement, which of the following must be used for a more complete description of the average
velocity of an object?
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4.
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What is the
speed of an object at rest? a. | 0.0 m/s | c. | 9.8 m/s | b. | 9.81 m/s | d. | 1.0 m/s | | | | |
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5.
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Which of the
following is the expression for average velocity?
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6.
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A hiker
travels south along a straight path for 1.5 h with an average velocity of 0.75 km/h, then travels
south for 2.5 h with an average velocity of 0.90 km/h. What is the hiker’s displacement for the
total trip? a. | 1.1 km to the
south | c. | 2.2 km to the
south | b. | 3.4 km to the south | d. | 6.7 km to the south | | | | |
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Short Answer
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7.
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Distinguish
between the displacement of a traveler who takes a train from New York to Boston and the displacement
of a traveler who flies from Boston to New York. Be sure to compare the magnitudes of the
displacements.
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Displacement (m) | Time (s) | 1.0 | 2.0 | 2.0 | 4.0 | 3.0 | 6.0 | 4.0 | 8.0 | 5.0 | 10.0 | | |
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8.
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Construct a
graph of position versus time using the data in the table above. What value is represented by the
slope of a graph? Find the slope between Dt = 1 s and Dt = 2 s. Be sure to use appropriate SI units.
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Problem
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9.
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The graph
above shows displacement versus time. What is the average velocity for line A?
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10.
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The graph
above shows displacement versus time. What is the average velocity for line C?
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11.
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The graph
above shows displacement versus time. What is the average velocity for line B?
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