Accelerated Motion
Practice Test
1.
Replacing an object in a motion diagram with a single point is called the __________.
a.
operational definition
b.
frame differential
c.
particle model
d.
alternative model
Hint
2.
The slope of the line tangent to the curve on a velocity-time graph at a specific instant of time is the __________.
a.
instantaneous velocity
b.
average velocity
c.
displacement
d.
instantaneous acceleration
Hint
3.
Which of the following correctly describes the displacement of an object that moves from position
d
i
to
d
f
?
a.
Δ
d
f
=
d
f
+
d
i
b.
Δ
d
=
d
f
+
d
i
c.
v
= Δ
d
/Δ
t
d.
Δ
d
=
d
f
-
d
i
Hint
4.
The multiplier for SI units with the prefix
micro
is __________.
a.
1/1,000,000,000
b.
1/1,000,000,000,000,000
c.
1/1,000,000,000,000
d.
1/1,000,000
Hint
5.
What is a rope's velocity 4.0 s after being dropped from a hovering helicopter?
a.
-4.0×10
2
m/s
b.
-2.0×10
1
m/s
c.
-4.0×10
1
m/s
d.
4.0×10
1
m/s
Hint
6.
The multiplier for SI units with the prefix
deci
is __________.
a.
1/100
b.
100
c.
10
d.
1/10
Hint
7.
How long will it take an airplane at rest that accelerates uniformly at 2.5 m/s
2
to reach a ground velocity of 7.0×10
1
m/s that is required for take off?
a.
4 s
b.
35 s
c.
28 s
d.
11 s
Hint
8.
What value is calculated by dividing rise by run?
a.
the slope of a straight line
b.
angular velocity
c.
length of a straight line
d.
acceleration of a moving object exhibiting uniform motion
Hint
9.
In Figure 1-10, if a fourth student measured the spring's length to be 14.2 ± 0.2 cm, would this agree with any of the other students' measurements?
a.
No.
b.
Yes, it agrees with students 1 and 3.
c.
Yes, it agrees with only student 1.
d.
Yes, it agrees with all three students.
Hint
10.
In a position-time graph,
t represents __________.
a.
total distance
b.
temperature
c.
time
d.
telial
Hint
11.
A car moving north at 8.0×10
1
turns and travels south at 65 km/h. What are the magnitude and direction of the change in velocity?
a.
145 km/h, north to south
b.
25 km/h
c.
25 km/h, north to south
d.
145 km/h, south to north
Hint
12.
The point at which a line crosses the
y
-axis is the __________.
a.
parallax
b.
rise
c.
y
-intercept
d.
slope
Hint
13.
When an object is in motion, its __________ changes.
a.
shape
b.
acceleration
c.
position
d.
size
Hint
14.
A motion diagram is a series of images of a moving object that records its position after __________.
a.
equal time intervals
b.
1/30 s
c.
it comes to rest
d.
an acceleration
Hint
15.
On a position-time graph, rise = __________.
a.
Δ
t
b.
Δ
d
c.
Δ
v
d.
Δ
s
Hint
16.
Based on the graph of Figure 2-21, where would the object be at
t
= 7 s?
a.
- 7 meters
b.
15 meters
c.
- 10 meters
d.
-15 meters
Hint
17.
A car with a velocity of 30 m/s is accelerated uniformly at the rate of 2.0 m/s
2
for 10 s. What is its final velocity?
a.
40 m/s
b.
50 m/s
2
c.
40 m/s
2
d.
50 m/s
Hint
18.
A 75-kg swimmer steps off a 10.0-m tower. What is the swimmer's velocity on hitting the water?
a.
38.3 m/s
b.
-14.0 m/s
c.
0.25 m/s
d.
27.1 m/s
Hint
19.
__________ describes the degree of exactness in a measurement.
a.
Precision
b.
Accuracy
c.
Significance
d.
Parallax
Hint
20.
Based on the graph of Figure 2-21, what is the object's velocity at
t
= 4 s?
a.
0 m/s
b.
4 m/s
c.
-5 m/s
d.
5 m/s
Hint
