Transcript Prentice Hall Presentation Pro

Pretest
Chapter 11
1. How many meters are in 28 km?
2. Convert 35 km/h to a speed in m/s.
3. Rearrange the following equation to solve for d : v =
d
t
.
4. Rearrange the following equation to solve for vf : a = (vf – vi )/t.
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Pretest (continued)
Chapter 11
5. What are the SI units for distance and time?
6. Which of the following describes the slope of a line?
a.
b.
c.
d.
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rise x run
run/rise
run – rise
rise/run
Pretest (continued)
Chapter 11
7. If a graph uses units of meters on the vertical axis and units of
seconds on the horizontal axis, what would be the units of the
slope of a line on the graph?
8. Which of the following is true about a curved line on a graph?
a.
b.
c.
d.
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The slope is the same at every point.
The slope of the line may be different at every point.
The line has no slope.
The slope of the line is zero.
Interest Grabber
Section 11.1
Describing Motion
Accurately describing the motion of an object using only words
can be difficult.
1. Choose a destination near your home, such as school, a
particular store, or a friend’s house. Write out a set of
directions describing how someone would get from your
home to the location.
2. Draw a map illustrating the directions you wrote out
in Step 1.
3. Was it easier to write out the description or to draw the
map? Which method is easier to use to find the location?
Explain your answers.
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Reading Strategy
Section 11.1
Predicting
a. Answers may vary. Sample answer: Frame of reference may
mean the range of distances or area that you are considering in a
problem.
b. Frame of reference is a system of objects that are not moving
with respect to one another. Frames of reference are important
because they are needed to accurately describe motion.
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Distance: Displacements
Along a Line
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Figure 3
Distance: Displacements
Along a Line
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Figure 3
Distance: Displacements
Along a Line
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Figure 3
Distance: Displacements
Along a Line
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Figure 3
Distance: Displacements
Along a Line
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Figure 3
Distance: Displacements
Along a Line
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Figure 3
Interest Grabber
Section 11.2
Distance-Time Graphs
The distance traveled by an object in
a period of time often is expressed
using a line graph. A line graph
visually conveys information using
sets of data points.
1. Copy the blank graph below
on your paper. Complete the
graph by plotting the given
data points on the graph.
Each set of data points
represents (time, distance).
Note that time is measured in
seconds and distance is
measured in meters. Connect
the plotted points with a
straight line.
Data points: (0, 0), (2, 40),
(4, 80), (6, 120), (8, 160),
(10, 200)
2. Describe the motion shown on
the graph.
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Reading Strategy
Section 11.2
Monitoring Your Understanding
Answers may vary. Sample answers shown below.
b. I could use this to calculate various speeds,
a. Average speed is distance
like the average speed at which I travel
divided by time.
getting to school.
c. Instantaneous speed is
different from average speed. d. You can’t use a single speedometer reading
to determine how long a trip will take.
e. Velocity is not the same
as speed.
f. This could be useful in giving directions or in
describing the path that you take on a walk.
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Calculating Average
Speed
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Section 11.2
Calculating Average
Speed
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Section 11.2
Calculating Average
Speed
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Section 11.2
Calculating Average
Speed
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Section 11.2
Distance-Time Graphs for
Motion of Three Cars
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Section 11.2
Distance-Time Graphs for
Motion of Three Cars
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Section 11.2
Distance-Time Graphs for
Motion of Three Cars
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Section 11.2
Interest Grabber
Section 11.3
Speed-Time Graphs
The speed an object travels in a period 1. Describe the speed of the
of time can be expressed on a graph.
object shown on the graph.
This type of graph can give useful
2. The slope of the line on a
information about the object’s motion.
distance-time graph
The speed-time graph of the object in
represents the change in
Section 11.2 Interest Grabber is
distance (m) per the change in
shown below.
time (s). Thus, the slope of a
distance-time graph gives
speed (m/s). What information
does the slope of a speedtime graph give you?
3. What is the slope of the line
on the speed-time graph?
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Section 11.3
Reading Strategy
Summarizing
a. speed (or direction)
c. m/s2
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b. direction (or speed)
Measuring Acceleration
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Section 11.3
Measuring Acceleration
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Section 11.3
Measuring Acceleration
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Section 11.3
Measuring Acceleration
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Section 11.3
Speed-Time Graphs
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Figures 16 and 17
Speed-Time Graphs
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Figures 16 and 17
Distance-Time Graph of
Accelerated Motion
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Figure 18
Pretest Answers
Chapter 11
1. How many meters are in 28 km?
2800 m
2. Convert 35 km/h to a speed in m/s.
0.97 m/s
3. Rearrange the following equation to solve for d : v =
d
t
.
d = vt
4. Rearrange the following equation to solve for vf : a = (vf – vi )/t.
vf = at – vi
Click the mouse button to display the answers.
Pretest Answers
Chapter 11
(continued)
5. What are the SI units for distance and time?
meters and seconds
6. Which of the following describes the slope of a line?
a.
b.
c.
d.
rise x run
run/rise
run – rise
rise/run
Click the mouse button to display the answers.
Pretest Answers
Chapter 11
(continued)
7. If a graph uses units of meters on the vertical axis and units of
seconds on the horizontal axis, what would be the units of the
slope of a line on the graph?
m/s
8. Which of the following is true about a curved line on a graph?
a.
b.
c.
d.
The slope is the same at every point.
The slope of the line may be different at every point.
The line has no slope.
The slope of the line is zero.
Click the mouse button to display the answers.
Interest Grabber
Section 11.1
Answers
1. Choose a destination near your home, such as school, a
particular store, or a friend’s house. Write out a set of
directions describing how someone would get from your
home to the location.
Possible answers must provide adequate instructions
describing how to get from the home to the chosen location.
2. Draw a map illustrating the directions you wrote out in Step 1.
Your maps must illustrate how to travel from home to the
chosen location.
3. Was it easier to write out the description or to draw the map?
Which method is easier to use to find the location? Explain
your answers.
Accept either response if students provide reasons. Students
will most likely say that the map is easier to write and use.
Interest Grabber
Section 11.2
Answers
1. Copy the blank graph below on your paper. Complete the graph by
plotting the given data points on the graph. Each set of data points
represents (time, distance). Note that time is measured in seconds
and distance is measured in meters. Connect the plotted points with a
straight line.
Data points: (0, 0), (2, 40), (4, 80), (6, 120), (8, 160), (10, 200)
2. Describe the motion
shown on the graph.
Possible answers
include that the object
is traveling at a
constant speed
and/or that the object
traveled 200 meters
in 10 seconds.
Interest Grabber
Section 11.3
Answers
1. Describe the speed of the object shown on the graph.
The object is traveling at a constant speed of 20 m/s.
2. The slope of the line on a distance-time graph represents
the change in distance (m) per the change in time (s).
Thus, the slope of a distance-time graph gives speed
(m/s). What information does the slope of a speed-time
graph give you?
The slope of a speed-time graph represents the
acceleration of the object—its change in speed over
the time.
3. What is the slope of the line on the speed-time graph?
The slope of the line is 0.
Chapter 11
Go Online
Data sharing
Self-grading assessment
For links on distance and displacement, go to
www.SciLinks.org and enter the Web Code as follows:
ccn-2111.
For links on motion, go to www.SciLinks.org and enter
the Web Code as follows: ccn-2112.
For links on acceleration, go to www.SciLinks.org and
enter the Web Code as follows: ccn-2113.