Physics Principles and Problems 2009

Chapter 3: Accelerated Motion

Chapter Test Practice

1
__________ is the change in velocity divided by the time needed for the change to occur.
A)Displacement
B)Average velocity
C)Average acceleration
D)Speed
2
Acceleration describes the rate of change in __________.
A)position
B)velocity
C)mass
D)gravity
3
__________ means that equal displacements occur during successive equal time intervals.
A)Average speed
B)Uniform motion
C)Average acceleration
D)Uniform acceleration
4
If a car travels 100 km in a straight line in the first hour of its trip, 100 km in a straight line in the next hour, and continues in this way, its motion is __________.
A)accelerated
B)dynamic
C)irregular
D)uniform
5
The slope of the line tangent to the curve on a velocity-time graph at a specific instant of time is the __________.
A)average velocity
B)instantaneous velocity
C)instantaneous acceleration
D)displacement
6
A car moving north at 80 km/h turns and travels south at 65 km/h. What are the magnitude and direction of the change in velocity?
A)145 km/h, south to north
B)145 km/h, north to south
C)25 km/h, north to south
D)25 km/h, south to north
7

If the motion in the figure below continued on at that same acceleration, what would the object's speed be at t = 10.00 s?

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A)25.0 m/s
B)100.0 m/s
C)50.0 m/s
D)40.0 m/s
8
How far does a car travel in 30.0 s while its velocity is changing from 50.0 km/h to 80.0 km/h at a uniform rate of acceleration?
A)1.95 × 103 m
B)252 m
C)5.41×102
D)1.08 × 103 m
9

In the figure below, what is the displacement of the object between 0.0 and 5.0 s?

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A)75.0 m
B)5.0 m
C)150.0 m
D)30.0 m
10
A car with a velocity of 30 m/s accelerates uniformly at the rate of 2.0 m/s2 for 10 s. What is its final velocity?
A)50 m/s2
B)40 m/s2
C)40 m/s
D)50 m/s
11
How long will it take an airplane at rest that accelerates uniformly at 2.5 m/s2 to reach the ground velocity of 7.0×101 m/s that is required for take off?
A)28 s
B)35 s
C)11 s
D)4 s
12
A car accelerates uniformily at a rate of 0.50 m/s2 for 1.0×101 s. Its final velocity is 23 m/s. What is the initial velocity?
A)18 m/s2
B)28 m/s
C)28 m/s2
D)18 m/s
13

The a-t graph corresponding to the v-t graph below would be a ____.

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A)straight line with a constant positive slope
B)line beginning at the origin with increasing positive slope
C)straight vertical line
D)straight horizontal line above the t axis
14
What is the minimum length runway needed to accommodate airplanes that can accelerate uniformly at 2.7 m/s2 and must reach a ground velocity of 64 m/s before they can take off?
A)7.6×102 m
B)1.5×102 m
C)7.6×103 m
D)1.5×103 m
15
Find the uniform acceleration that would cause a car's velocity to change from 27 m/s to 45 m/s in a 6.0-s period.
A)3.0 m/s
B)18.0 m/s
C)18.0 m/s2
D)3.0 m/s2
16

In the graph below, what is the total displacement of the object?

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A)75.0 m
B)0 m
C)-25.0 m
D)500.0 m
17
A 75-kg swimmer steps off a 10.0-m tower. What is the swimmer's velocity on hitting the water?
A)-14.0 m/s
B)27.1 m/s
C)38.3 m/s
D)0.25 m/s
18
A ball falls freely from rest for 15.0 s. Calculate the ball's velocity after 15.0 s.
A)-78 m/s
B)78 m/s
C)0 m/s
D)-147 m/s
19
A tennis ball is dropped from 1.5 m above the ground, touches the ground for 0.008 s and rebounds to a height of 0.75 m. What is the ball's velocity when it hits the ground?
A)-5.4 m/s2
B)-5.4 m/s
C)-3.8 m/s
D)3.8 m/s2
20
A bicycle rider travels 15 km in 1.25 hours. What is the rider's average speed?
A)10.5 km/h
B)13.75 km/h
C)12 km/h
D)22.5 km/h
21
Displacement is a change in __________.
A)speed
B)position
C)velocity
D)distance
22
A track runner begins running from the starting line and reaches his race pace of 4-minutes per mile in 5 seconds. What is the runner's acceleration?
A)1.33 m/s2
B)6.67 m/s2
C)0.05 m/s2
D)0.001 m/s2
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