Name:______________________________Class:__________________ Date:__________________
Assessment
Motion in One Dimension
Teacher Notes and Answers
2 Motion in One Dimension
ACCELERATION
1.
2.
3.
4.
5.
6.
7.
8.
9.
d
b
c
c
a
d
b
d
CD, DE, EF, and FG. The displacement of
the jogger with a constant acceleration is
equal to the average velocity during a time
interval multiplied by the time interval.
Because the time intervals are equal, the
displacements are in the same order as
decreasing average velocities. By inspection
the average velocity decreases in the order
CD, DE, EF, and FG.
10. 2.6 m
Given
vi = 0.25 m/s
a = 0.40 m/s2
t = 3.0 s
Solution
x = vi t + 12 a(t)2 =
(0.25m/s)(3.0s) +
(0.40 m/s2 )(3.0s)2
2
= 2.6 m
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Assessment
Motion in One Dimension
Section Quiz: Acceleration
Write the letter of the correct answer in the space provided.
_____ 1. The average acceleration is the ratio of which of the following
quantities?
a. d:v
b. d:t
c. v:v
d. v:t
_____ 2. The speed of a car will increase if the car’s
a. initial velocity is positive and its acceleration is zero.
b. initial velocity is positive and its acceleration is positive.
c. initial velocity is positive and its acceleration is negative.
d. initial velocity is negative and its acceleration is positive.
_____ 3. For a scooter with a negative acceleration, which of the following
statements is always true?
a. The scooter is losing speed.
b. The final velocity of the scooter will be negative.
c. The initial velocity of the scooter will be greater than its final
velocity.
d. The scooter will have a negative displacement.
Questions 4–9 refer to the following velocity-time graph of a jogger. The positive
direction is away from the jogger’s home.
_____ 4. The jogger is at rest during which interval?
a. AB
c. DE
b. BC
d. EF
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Physics
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Section Quizzes
Name:______________________________Class:__________________ Date:__________________
Motion in One Dimension continued
_____ 5. During which of the following intervals does the jogger have a constant
positive velocity?
a. BC
b. CD
c. DE
d. FG
_____ 6. During which interval is the magnitude of the jogger’s acceleration the
greatest?
a. AB
b. BC
c. DE
d. EF
_____ 7. During which of the following intervals is the speed of the jogger
decreasing?
a. AB only
b. AB and CD
c. AB, CD, and EF
d. EF only
_____ 8. During which of the following intervals is the jogger’s motion toward
home?
a. CD and EF
b. DE only
c. EF only
d. EF and FG
9. Rank the four displacements for the time intervals CD, DE, EF, and FG in
decreasing order. Explain your answer.
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10. A cat walking at 0.25 m/s sees a mouse and accelerates uniformly at 0.40 m/s2
for 3.0 s. What is the cat’s displacement during this time?
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
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Section Quizzes