Name
Date
Directed Reading for
Content Mastery
Section 1
Section 2
■
■
Class
What is motion?
Acceleration
Directions: Circle the term that correctly completes the sentence.
1. A golfball’s acceleration is +3 m/s2. The ball is (speeding up, slowing down.)
2. An object’s (speed, displacement) represents its distance and direction from its
starting point.
3. A student walks 10 m in 2 s. Her average speed is (20 m/s, 5 m/s).
5. During positive acceleration, an object’s final speed is (greater, less) than its
initial speed.
6. To calculate acceleration, first subtract the initial speed from the final speed.
Then divide this difference by the (distance moved, time period).
Directions: The graph describes the movement of a car. Match the letters in the graph to the sentences below.
7. The car moves at a
constant speed.
90
9. The car undergoes
negative acceleration as
it approaches a stoplight.
10. The car undergoes
positive acceleration as
it moves away from a
stoplight.
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
80
8. The car sits motionless
at a stoplight.
C
70
60
Velocity (km/hr)
Meeting Individual Needs
4. A plane moving at a rate of 400 km/h west has a different (velocity, speed) than
a plane moving 400 km/h northwest.
B
50
40
30
D
20
10
A
0
1
2
3
4
Time (minutes)
20 Motion and Momentum
5
6
7
Name
Date
2
Class
Acceleration
Reinforcement
Directions: In the space provided, substitute a word for the word in italics to make the statement correct.
1. Velocity is a change in an object’s motion.
2. Acceleration is the rate of change of velocity with distance.
3. When an object slows down, it has no acceleration.
Directions: Answer the following questions on the lines provided.
4. A merry-go-round horse travels at a constant speed. Is it accelerating? Explain.
6. If an object has an acceleration of –3 m/s2, describe its motion.
Directions: Study the velocity-time graph for an object in motion. Then answer the following questions.
25
G
F
E
15
B
10
C
5
D
H
A
O
5
10
15
20
25
30
35
Time (s)
7. In what interval does the object have the fastest acceleration?
8. Over what interval(s) does the object have a negative acceleration?
9. Over what interval is the object stopped?
28 Motion and Momentum
40
45
I
50
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
20
Velocity
Meeting Individual Needs
5. What is the unit for speed? For acceleration?
Name
Date
Section 2 Acceleration
Acceleration
and Motion
(continued)
Distinguish the three ways that an object can accelerate. Complete
the concept map.
I found this information
on page
.
Acceleration
includes
1. speeding up
2. slowing down
3. changing
direction
I found this information
on page
.
Complete the mathematical equation to calculate acceleration for
objects moving in a straight line.
Acceleration Equation
final speed
Have students who
are good in math
partner with students
who are less skilled
to work several examples of acceleration
calculations.
I found this information
on page
.
acceleration 5
(in m/s2)
(in m/s) 2 initial speed (in m/s)
time (in s)
Analyze the equation above to rewrite it using symbols.
a5
(s f 2 s i )
t
Compare and contrast positive and negative acceleration by
completing the chart.
Types of Acceleration
Positive
6
Motion and Momentum
Negative
Change in
speed
increase
decrease
Relationship of
initial speed to
final speed
Initial speed is
less than final
speed.
Initial speed is
greater than final
speed.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Calculating
Acceleration
Name
Date
Section 2 Acceleration
Calculating
Acceleration
I found this information
on page
.
(continued)
Analyze the acceleration graph below. Label the parts of the graph
showing zero acceleration, positive acceleration, and negative
acceleration.
Speed v. Time
8
7
Zero acceleration
Speed (m/s)
6
5
Negative
acceleration
4
3
Positive
acceleration
2
1
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
0
1
2
3
4 5 6
Time (s)
7
8
9
Summarize how you can identify each type of acceleration on an
acceleration graph. Complete the sentences.
A line for positive acceleration slopes
up from left to right
.
A line for negative acceleration slopes
down from left to right
.
A line for zero acceleration
is horizontal
.
S YNTHESIZE I T
A jogger runs around a circular track. She starts at a speed
of 2 m/s, then speeds up to 6 m/s. She runs at that speed for 20 minutes, and then
comes to a stop. Describe her acceleration. Is it ever zero?
Her acceleration is positive as she speeds up, and negative as she slows down. Her
acceleration is never zero, because she is always changing direction as she moves
around the circle of the track.
Motion and Momentum
7