Forces in One Dimension
Practice Test
1.
A common symbol for the time interval is __________.
a.
Δ
v
b.
t
i
c.
Δ
t
d.
t
f
Hint
2.
On Earth, a scale shows that you weigh 490 N. What is your mass?
a.
22 kg
b.
50 kg to 5.0×10
1
kg
c.
75 kg
d.
100 kg
Hint
3.
On a position-time graph, run = __________.
a.
Δ
d
b.
Δ
a
c.
Δ
v
d.
Δ
t
Hint
4.
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.
3.8 m/s
2
c.
-5.4 m/s
d.
-3.8 m/s
Hint
5.
A 75-kg person pushes a 12-kg person in a swing with a force of 3 N. What is the acceleration of the person doing the pushing?
a.
0.25 m/s
2
b.
0.4 m/s
2
c.
25 m/s
2
d.
0.04 m/s
2
Hint
6.
In Figure 3-3, if the acceleration were calculated using points at
t
= 0.00 s and
t
= 4.00 s, what would it be?
a.
2.50 m/s
2
b.
5.00 m/s
2
c.
4.00 m/s
2
d.
10.00 m/s
2
Hint
7.
In Figure 4-16c, if the box has a mass of 6.0 kg, what will the normal force of the table on the box be?
a.
9.8 N
b.
110 N
c.
8.8 N
d.
50 N
Hint
8.
__________ means that equal displacements occur during successive equal time intervals.
a.
Average acceleration
b.
Average speed
c.
Uniform acceleration
d.
Uniform motion
Hint
9.
On a position-time graph, rise = __________.
a.
Δ
s
b.
Δ
d
c.
Δ
t
d.
Δ
v
Hint
10.
A(n) __________ is a series of images of a moving object that records its position after equal time intervals.
a.
operational definition
b.
motion diagram
c.
frame
d.
association
Hint
11.
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
2
b.
3.0 m/s
2
c.
18.0 m/s
d.
3.0 m/s
Hint
12.
The force exerted by a fluid on an object moving through the fluid is called the __________.
a.
terminal velocity
b.
drag force
c.
apparent weight
d.
net force
Hint
13.
A 75-kg swimmer steps off a 10.0-m tower. What is the swimmer's velocity on hitting the water?
a.
27.1 m/s
b.
-14.0 m/s
c.
38.3 m/s
d.
0.25 m/s
Hint
14.
If the force used to generate the graph in Figure 4-3b were doubled, how, if at all, would the graph change?
a.
The
y
-intercept of the graph would be a non-zero number.
b.
The slope of the graph would be halved.
c.
It would not change.
d.
The slope of the graph would be doubled.
Hint
15.
To subtract two vectors, __________.
a.
subtract 180° from θ, then use the Law of Cosines
b.
use the equation
R
2
=
A
2
-
B
2
c.
reverse the direction of the second vector and then add them
d.
use the same process as for adding them, then change the sign of the value
Hint
16.
Replacing an object in a motion diagram with a single point is called the __________.
a.
operational definition
b.
particle model
c.
alternative model
d.
frame differential
Hint
17.
If a car is traveling 1.0×10
2
and comes to a stop in 3.0 min, what is the car's acceleration?
a.
0.15 m/s
2
b.
0.56 m/s
2
c.
- 0.56 m/s
2
d.
- 0.15 m/s
2
Hint
18.
The vector sum of two or more forces on an object is called the __________ force.
a.
composite
b.
effort
c.
resistant
d.
net
Hint
19.
The slope of the line tangent to the curve on a position-time graph at a specific time is the __________.
a.
displacement
b.
average velocity
c.
instantaneous acceleration
d.
instantaneous velocity
Hint
20.
You and a friend each walk 8.0 km. You walk at 6.4 km/h; your friend walks 8.1 km/h. How long will your friend wait for you at the end of the walk?
a.
30 minutes
b.
0.5 h
c.
1.7 h
d.
15 minutes
Hint
