Accelerated Motion
Practice Test
1.
Find the uniform acceleration that causes a car's velocity to change from 27 m/s to 45 m/s in a 6.0-s period.
a.
18.0 m/s
b.
3.0 m/s
2
c.
18.0 m/s
2
d.
3.0 m/s
Hint
2.
In the particle model, the __________ of the object are (is) ignored.
a.
acceleration
b.
internal motions
c.
position
d.
motion diagram
Hint
3.
On a position-time graph, rise = __________.
a.
Δ
s
b.
Δ
v
c.
Δ
t
d.
Δ
d
Hint
4.
Acceleration describes a change in __________.
a.
momentum
b.
mass
c.
gravity
d.
velocity
Hint
5.
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/s
2
b.
-5.4 m/s
c.
3.8 m/s
2
d.
-3.8 m/s
Hint
6.
What is the minimum length runway needed to accommodate airplanes that can accelerate uniformly at 2.7 m/s
2
and must reach a ground velocity of 64 m/s before they can take off?
a.
7.8×10
2
m
b.
7.8×10
3
m
c.
1.5×10
2
m
d.
1.5×10
3
m
Hint
7.
What value is calculated by dividing rise by run?
a.
the slope of a straight line
b.
length of a straight line
c.
angular velocity
d.
acceleration of a moving object exhibiting uniform motion
Hint
8.
In order to use the particle model, the __________ must be __________ moved.
a.
size of the object, much greater than the distance
b.
distance, much less than the size of the object
c.
distance, equal to the size of the object
d.
size of the object, much less than the distance
Hint
9.
The horizontal direction in a coordinate system is called the __________.
a.
x
-axis
b.
z
-axis
c.
y
-axis
d.
scale
Hint
10.
On a position-time graph, run = __________.
a.
Δ
v
b.
Δ
d
c.
Δ
a
d.
Δ
t
Hint
11.
In Figure 1-16, the
y
-intercept of the graphed line is 13.7 cm. What is the physical meaning of this intercept?
a.
It is the length of the spring when the experiment is over.
b.
It is the distance from the top of the spring to the suspended mass.
c.
It is the distance from the bottom of the spring to the suspended mass.
d.
It is the length of the spring when no masses are suspended from it.
Hint
12.
In Figure 2-20, if the blue jogger were ahead of the red jogger at
t
= 0 s, but they both had the same velocities as in the text, how (if at all) would the graph change?
a.
The lines would still cross at zero, but the slope of the blue jogger's line would be steeper.
b.
The labels on the lines would be reversed.
c.
The slopes of the lines would remain the same, but the blue jogger's line would cross the
y
-axis above zero.
d.
There would be no change.
Hint
13.
A ball falls freely from rest for 15.0 s. Calculate the ball's velocity after 15.0 s.
a.
147 m/s
b.
-78 m/s
c.
-147 m/s
d.
78 m/s
Hint
14.
If the motion in Figure 3-3 continued on at that same acceleration, what would the object's speed be at
t
= 10.00 s?
a.
50.0 m/s
b.
100.0 m/s
c.
25.0 m/s
d.
40.0 m/s
Hint
15.
In Figure 1-4, which of the following operations would yield an answer of 0.5417 to the correct number of significant digits?
a.
3.90/ 7.20
b.
3.900/7.200
c.
3.900/7.2
d.
3.9000 / 7.2000
Hint
16.
Convert 1.45 km to meters.
a.
1.45×10
-3
ft
b.
14.5×10
3
km
c.
0.145×10
-3
m
d.
1.45×10
3
m
Hint
17.
Based on the graph of Figure 2-21, where would the object be at
t
= 7 s?
a.
-15 meters
b.
- 10 meters
c.
- 7 meters
d.
15 meters
Hint
18.
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
19.
__________ describes the degree of exactness in a measurement.
a.
Accuracy
b.
Precision
c.
Significance
d.
Parallax
Hint
20.
A(n) __________ tells you where the zero point of the variable you are studying is located and the direction in which the values increase.
a.
origin
b.
axis
c.
coordinate system
d.
intercept
Hint
