Conceptual Physics, 12e (Hewitt)
Chapter 3 Linear Motion
3.1 Multiple-Choice Questions
1) A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has
a speed of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer: D
Diff: 1
Topic: Motion is Relative
2) A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction
has a speed of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer: A
Diff: 1
Topic: Motion is Relative
3) Katelyn runs along the aisle of a train that moves at 8 m/s. Her speed relative to the floor is 3
m/s. Her speed relative to an observer at rest on the ground is
A) 5 m/s.
B) 11 m/s.
C) either depending on her running direction
D) none of the above
Answer: C
Diff: 2
Topic: Motion is Relative
4) You’re at rest in a hammock when a hungry mosquito sees an opportunity for lunch. A mild
2-m/s breeze is blowing. If the mosquito joins you for lunch it should hover over you by flying
A) against the breeze at 2 m/s.
B) with the breeze at 2 m/s.
C) a bit faster than wind speed.
D) none of the above
Answer: A
Diff: 2
Topic: Motion is Relative
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5) Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the same direction.
Jake’s speed relative to the ground is
A) 6 m/s.
B) 10 m/s.
C) 14 m/s.
D) none of the above
Answer: C
Diff: 2
Topic: Motion is Relative
6) Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction.
Jake’s speed relative to the ground is
A) 6 m/s.
B) 10 m/s.
C) 14 m/s.
D) none of the above
Answer: A
Diff: 2
Topic: Motion is Relative
7) The speedometer of an automobile reads
A) average speed.
B) instantaneous speed.
C) accelerated speed.
Answer: B
Diff: 1
Topic: Speed and Velocity
8) The two measurements necessary for calculating average speed are
A) acceleration and time.
B) velocity and time.
C) distance and time.
D) distance and acceleration.
E) velocity and distance.
Answer: C
Diff: 1
Topic: Speed and Velocity
9) When you walk at an average speed of 4 m/s, in 5 s you’ll cover a distance of
A) 2 m.
B) 10 m.
C) 15 m.
D) 20 m.
Answer: D
Diff: 2
Topic: Speed and Velocity
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10) A vehicle undergoes acceleration when it
A) gains speed.
B) loses speed.
C) changes its direction.
D) all of the above
Answer: D
Diff: 1
Topic: Speed and Velocity
11) The average speed of a horse that gallops 10 kilometers in 30 minutes is
A) 15 km/h.
