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, 5 blocks East, 8 blocks South, and finally 8 blocks West in order to deliver a package in the traffic, congested city. If his trip took 36 minutes, what was the magnitude of his average velocity in blocks/minute?
6.67 x 10
^{-1}
2.22 x 10
^{-1}
5.83 x 10
^{0}
1.62 x 10
^{-1}
2.4 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?
139.4 deg
149.0 deg
239.0 deg
121.0 deg
220.6 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 successive
directions that change by 90º
traveling in a circle
standing still
traveling in a
straight line
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Question 4
A scalar is a quantity that can be completely described by stating its
size and direction
direction
size
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Question 5
A family taking a vacation traveled 5 hours at 65 mph and then 3 hours at only 47 mph. What was their average speed during this trip?
56.0 mph
58.3 mph
53.8 mph
51.0 mph
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Question 6
Which quantity is NOT a scalar?
distance
mass
acceleration
time
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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
constant speed since it demands that the object
has to maintain a constant rate
regardless of its direction of motion
the two terms are completely equivalent
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Question 8
A student warming up for practice travels one full circuit, 400 meters, around the track. Initially he jogs 72 meters at 1.5 m/sec, then runs 216 meters at 2.2 m/sec, and finally cools down by finishing the final 112 meters at 1.0 m/sec. What was his average speed?
1.55 m/sec
1.57 m/sec
1.74 m/sec
2.35 m/sec
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Question 9
What was the student's average velocity in
Question #8
?
cannot be determined
the same as his average speed
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 C
B and D
A and D
C and D
B and C
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Question 11
A moving van completes its journey of 540 kilometers in 8 hours. Approximately how far should it have traveled 5.5 hours after beginning its trip?
98 km
255 km
169 km
371 km
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