Practice Problems
Description of Motion - Scalar vs Vector Quantities
Directions:
On this worksheet you will practice with the basic definitions of introductory motion.
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Question 1
A bike messenger traveled 3 blocks North, 4 blocks East, 6 blocks South, and finally 10 blocks West in order to deliver a package in the traffic, congested city. If his trip took 42 minutes, what was the magnitude of his average velocity in blocks/minute?
5.48 x 10
^{-1}
6.71 x 10
^{0}
1.6 x 10
^{-1}
2.3 x 10
^{1}
2.14 x 10
^{-1}
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Question 2
If the messenger in
Question #1
could have traveled directly to his destination, what would have been the direction of his net displacement?
204.1 deg
153.4 deg
116.6 deg
206.6 deg
155.9 deg
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Question 3
The magnitude of an object's average velocity can ONLY equal the magnitude of its average speed when the object is
traveling in a
straight line
traveling in successive
directions that change by 90º
standing still
traveling in a circle
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Question 4
A scalar is a quantity that can be completely described by stating its
size and direction
size
direction
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Question 5
A family taking a vacation traveled 4 hours at 65 mph and then 3 hours at only 49 mph. What was their average speed during this trip?
55.9 mph
48.7 mph
57.0 mph
58.1 mph
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Question 6
Which quantity is NOT a scalar?
distance
acceleration
time
mass
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Question 7
Which description of an object's motion is more specific: moving at a constant speed or moving at a constant velocity?
constant velocity since it demands that the object
not only move at a constant rate,
but also maintain a constant direction
the two terms are completely equivalent
constant speed since it demands that the object
has to maintain a constant rate
regardless of its direction of motion
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Question 8
A student warming up for practice travels one full circuit, 400 meters, around the track. Initially he jogs 84 meters at 1.5 m/sec, then runs 252 meters at 2.2 m/sec, and finally cools down by finishing the final 64 meters at 1.0 m/sec. What was his average speed?
2.35 m/sec
1.57 m/sec
1.71 m/sec
1.86 m/sec
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Question 9
What was the student's average velocity in
Question #8
?
the same as his average speed
cannot be determined
0 m/sec
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Question 10
During a 30 minute period of time, one car moves at a constant velocity of 45 mph, N, while a second car moves at a constant velocity of 45 mph, W. During this time interval, the cars would have the same
A. instantaneous speed
B. instantaneous velocity
C. displacement
D. acceleration
A and D
C and D
B and D
A and C
B and C
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Question 11
A moving van completes its journey of 630 kilometers in 10 hours. Approximately how far should it have traveled 8 hours after beginning its trip?
504 km
403 km
126 km
79 km
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