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12.2
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Study Guide—Speed
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Pages 346–350
MAIN IDEAS–Use the space below to make notes on the main ideas of this section.
The speed of an object is equal to the
distance an object travels divided by
the time interval.
The average speed of an object is the
total distance the object travelled
divided by the total time taken.
The average speed equation is:
⌬d df ⫺ di
vav ⫽ —– ⫽ ———
⌬t
tf ⫺ ti
You can rearrange the average speed
equation to solve for the time interval
or the distance travelled. Distance and
time units need to match those for
average speed.
The instantaneous speed of an object
is its speed at a particular instant in
time.
Average speed is the same as
instantaneous speed if an object’s
speed is constant (does not change).
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Chapter 12 Worksheet 12.2-2
Copyright © 2009 by Nelson Education Ltd.
Name:
12.2
Date:
Study Guide (continued)
VOCABULARY–Use the space below to write each definition in your own words.
speed
average speed
instantaneous speed
PRACTICE PROBLEMS–Calculate the average speed or the time for each of the horses in the
2000 m race. Show your calculations in the spaces below the table.
Horse 1
Horse 2
Horse 3
Horse 4
Distance (m)
2000
2000
2000
2000
Time (s)
125.4
Average Speed (km/h)
125.1
16.33
16.43
Horse 1
Horse 2
Horse 3
Horse 4
Copyright © 2009 by Nelson Education Ltd.
Chapter 12 Worksheet 12.2-2
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