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Quiz Feedback | Introductory Physics I with Laboratory
Feedback — Newton's 2nd Law (1D): General
You submitted this quiz on Thu 6 Jun 2013 6:50 PM PDT (UTC -0700). You got a
score of 19.27 out of 21.00. You can attempt again, if you'd like.
Some questions provided by Matter and Interactions (3rd. Ed.), R. Chabay & B. Sherwood.
Copyright (2010, John Wiley & Sons). This material is used by permission of John Wiley &
Sons, Inc.
Question 1
An object is moving in the +x direction. Which, if any, of the following statements might be true?
Check all that apply.
Your Answer
Score
The net force on the object is in the -x direction.

0.00
The net force on the object is zero.

0.33
The net force on the object is in the +x direction.

0.33
Total
Explanation
0.67 / 1.00
Question Explanation
Answer : The net force on the object is
zero.
The net force on the object is in the -x
direction.
The net force on the object is in the +x
direction.
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Question 2
An object is moving in the +x direction. Which, if any, of the following statements do you know
must be false? Check all that apply.
Your Answer
Score
The net force on the object is zero.

0.25
The net force on the object is in the +x direction.

0.25
The net force on the object is in the -x direction.

0.00

0.25
vx
is zero.
Total
Explanation
0.75 / 1.00
Question Explanation
Answer : vx is zero.
Question 3
You observe three carts moving to the right.
Cart A moves to the right at nearly constant speed.
Cart B moves to the right, gradually speeding up.
Cart C moves to the right, gradually slowing down.
Which cart or carts, if any, experience a net force to the right?
Your Answer
Score
Cart B

0.33
Cart A

0.33
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Explanation
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Cart C

Total
0.33
1.00 / 1.00
Question Explanation
Answer : Cart B.
Question 4
The diagram shows the velocity of an object and the net force acting on it at some instant in
time.
After a short amount of time, which of the following statements is true about the magnitude of the
velocity?
Your Answer
Score
Explanation
The magnitude of the velocity will decrease.
The magnitude of the velocity will increase.

1.00
The magnitude of the velocity will stay the same.
Total
1.00 / 1.00
Question Explanation
Answer : The magnitude of the velocity
will increase.
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Question 5
The diagram shows the velocity of an object and the net force acting on it at some instant in
time.
After a short amount of time, which of the following statements is true about the direction of the
velocity?
Your Answer
Score
Explanation
The velocity will be in a different direction that is not parallel
to the original direction.
The velocity will be in the opposite direction.
The direction of the velocity will be the same.
Total

1.00
1.00 /
1.00
Question Explanation
Answer : The direction of the velocity
will be the same.
Question 6
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The diagram shows the velocity of an object and the net force acting on it at some instant in
time.
After a short amount of time, which of the following statements is true about the magnitude of the
velocity? (You may assume that if there is any change in velocity in this situation, the time
interval is short enough such that the magnitude of that change in velocity is small compared to
the original velocity.)
Your Answer
Score
Explanation
The magnitude of the velocity will stay increase.
The magnitude of the velocity will stay the same.
The magnitude of the velocity will decrease.
Total

1.00
1.00 / 1.00
Question Explanation
Answer : The magnitude of the velocity
will decrease.
Question 7
The diagram shows the velocity of an object and the net force acting on it at some instant in
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time.
After a short amount of time, which of the following statements is true about the direction of the
velocity? (You may assume that if there is any change in velocity in this situation, the time
interval is short enough such that the magnitude of that change in velocity is small compared to
the original velocity.)
Your Answer
Score
Explanation
The velocity will be in a different direction that is not parallel
to the original direction.
The velocity will be in the opposite direction.
The direction of the velocity will be the same.
Total

1.00
1.00 /
1.00
Question Explanation
Answer : The direction of the velocity
will be the same.
Question 8
A truck driver slams on the brakes and the velocity of the truck changes from ‹11, 0, 0 › m/s to ‹
8, 0, 0 › m/s in 6 seconds. The truck has a mass of 12000 kg. Compute the (average) net force
exerted on the truck by the surroundings.
What is the x component of the net force (in Newtons)?
You entered:
-6000
Your Answer
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Score
Explanation
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-6000

Total
1.00
1.00 / 1.00
Question Explanation
Answer : -6000
Question 9
Following the previous question, what is the y component of the average net force (in Newtons)
exerted on the truck by the surroundings?
You entered:
0
Your Answer
0
Score

Total
Explanation
1.00
1.00 / 1.00
Question Explanation
Answer : 0
Question 10
Following the previous question, what is the z component of the average net force (in Newtons)
exerted on the truck by the surroundings?
You entered:
0
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Your Answer
0
Score

Total
Explanation
1.00
1.00 / 1.00
Question Explanation
Answer : 0
Question 11
During a time interval of one second, a ball moves in the +x or -x direction (that is, to the right or
the left), and a net force acts on the ball in the +x or -x direction. For each motion listed below,
check all the descriptions of net force that could produce that behavior. More than one
description may be valid for a particular motion.
(a) ball permanently at rest
Your Answer
Score
net force to the left with increasing magnitude

0.14
net force to the left with constant magnitude

0.14
net force = 0

0.14
net force to the right with decreasing magnitude

0.14
net force to the right with constant magnitude

0.14
net force to the right with increasing magnitude

0.14
net force to the left with decreasing magnitude

0.14
Total
Explanation
1.00 / 1.00
Question Explanation
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Answer : net force = 0
Question 12
(b) ball moving to the right at constant speed
Your Answer
Score
net force to the right with decreasing magnitude

0.14
net force = 0

0.14
net force to the right with constant magnitude

0.14
net force to the right with increasing magnitude

0.14
net force to the left with increasing magnitude

0.14
net force to the left with decreasing magnitude

0.14
net force to the left with constant magnitude

0.14
Total
Explanation
1.00 / 1.00
Question Explanation
Answer : net force = 0
Question 13
(c) ball moving to the left at constant speed
Your Answer
net force = 0
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Score

Explanation
0.14
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net force to the right with increasing magnitude

0.14
net force to the right with decreasing magnitude

0.14
net force to the left with increasing magnitude

0.14
net force to the left with constant magnitude

0.14
net force to the right with constant magnitude

0.14
net force to the left with decreasing magnitude

0.14
Total
1.00 / 1.00
Question Explanation
Answer : net force = 0
Question 14
(d) ball moving to the right with increasing speed
Your Answer
Score
net force to the right with increasing magnitude

0.00
net force to the left with increasing magnitude

0.14
net force to the right with constant magnitude

0.14
net force to the right with decreasing magnitude

0.00
net force to the left with decreasing magnitude

0.14
net force = 0

0.14
net force to the left with constant magnitude

0.14
Total
Explanation
0.71 / 1.00
Question Explanation
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Answer : net force to the right with
decreasing magnitude
net force to the right with constant
magnitude
net force to the right with increasing
magnitude
Question 15
(e) ball moving to the right with decreasing speed
Your Answer
Score
net force = 0

0.14
net force to the left with decreasing magnitude

0.00
net force to the right with increasing magnitude

0.14
net force to the right with decreasing magnitude

0.14
net force to the left with increasing magnitude

0.00
net force to the right with constant magnitude

0.14
net force to the left with constant magnitude

0.14
Total
Explanation
0.71 / 1.00
Question Explanation
Answer : net force to the left with
increasing magnitude
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net force to the left with constant
magnitude
net force to the left with decreasing
magnitude
Question 16
(f) ball moving to the left with increasing speed
Your Answer
Score
net force to the right with constant magnitude

0.14
net force = 0

0.14
net force to the right with increasing magnitude

0.14
net force to the right with decreasing magnitude

0.14
net force to the left with constant magnitude

0.14
net force to the left with decreasing magnitude

0.00
net force to the left with increasing magnitude

0.00
Total
Explanation
0.71 / 1.00
Question Explanation
Answer : net force to the left with
constant magnitude
net force to the left with increasing
magnitude
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net force to the left with decreasing
magnitude
Question 17
(g) ball moving to the left with decreasing speed
Your Answer
Score
net force to the right with constant magnitude

0.14
net force to the left with increasing magnitude

0.14
net force to the right with decreasing magnitude

0.00
net force = 0

0.14
net force to the left with decreasing magnitude

0.14
net force to the right with increasing magnitude

0.00
net force to the left with constant magnitude

0.14
Total
Explanation
0.71 / 1.00
Question Explanation
Answer : net force to the right with
increasing magnitude
net force to the right with decreasing
magnitude
net force to the right with constant
magnitude
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Question 18
At a certain time t, a proton's position is 21.6e−09, 0, 0 3 m and the its velocity is 2 3400, 0, 0 3
m/s. The proton (mass 1.7 × 10−27 kg) experiences a net force of 2 −1.2e−11, 0, 0 3 N. At a
time t + 5.1e−14 s, what is the x component of the proton's approximate velocity in m/s? (You
may assume that the force was approximately constant during this interval.)
You entered:
3040
Your Answer
3040
Score

Total
Explanation
1.00
1.00 / 1.00
Question Explanation
Answer : [2986,3094]
Question 19
Following the previous question, what is the y component of the proton's approximate velocity (in
m/s) at time t + 5.1e−14 s?
You entered:
0
Your Answer
0
Score

Total
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Explanation
1.00
1.00 / 1.00
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Question Explanation
Answer : 0
Question 20
Following the previous question, what is the z component of the proton's approximate velocity (in
m/s) at time t + 5.1e−14 s?
You entered:
0
Your Answer
0
Score

Total
Explanation
1.00
1.00 / 1.00
Question Explanation
Answer : 0
Question 21
At a certain instant a particle (mass=0.5 kg) is moving in the +x direction with velocity 14 m/s.
During the next 0.14 seconds a constant force acts on the particle, with
Fx
= −8 N and
Fy
=5
N. What is the magnitude of the velocity of the particle (in m/s) at the end of this 0.14 second
interval?
You entered:
11.84
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Your Answer
11.84
Score

Total
Explanation
1.00
1.00 / 1.00
Question Explanation
Answer : [11.25,12.43]
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