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Distance-time graphs
Mr. Lambert
Integrated Science 1A
Trimester 2, 2014
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Bell Ringer
Draw
a distance-time graph that
depicts the motion of the woman:
A woman walks 300 meters to get to the
post office. She stops for a short time
and realizes that she left the stove on in
her house. She quickly runs home.
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Agenda
1.
Finish Distance-time
graphs
2.
Speed Probe challenge
3.
Velocity
4.
Instantaneous speed
handout
5.
Exit Slip
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Learning Targets
On your Bell Ringer
Sheet, write the
following:
We will interpret
distance-time graphs
We will differentiate
speed and velocity
Distance
Downward sloping line – object
returning to start
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Simulation – the moving man
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http://phet.colorado.edu/en/simulation/moving-man
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Distance-time graphs
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Distance-time graphs
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Draw the following scenario
A
man walks forward at a constant
speed. Suddenly a dog starts to chase
him and he begins to run. The man
manages to outrun the dog and stops to
take a break and catch his breath. The
man then slowly walks back to his
starting point.
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Which
of the graphs shows that one of runners started 10
yards further ahead of the other? Explain your answer.
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In which of the following graphs above are both
runners moving at the same speed? Explain your
answer.
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Speed probe
Challenge: match
following graphs!
the motion in the
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Velocity
Speed
with direction!
Speed – Derryl drove his car at 60 mph.
Velocity – Derryl drove North in his car
at 60 mph
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Speed or velocity?
Micah
threw a football 75 meters in 3 seconds.
How fast did the football travel?
A
bee flew West to sting Sammy. It flew 3
meters in 1.25 seconds. How fast was the bee
flying?
Jessica
drove 100 miles North in 2 hours. How
fast was she traveling?
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Instantaneous vs average speed
Instantaneous
speed – speed at one
instant in time
https://www.youtube.com/watch?v=pfTT
Hx9kCHk
Instantaneous
worksheet
vs average speed
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Review for the QUIZ tomorrow!
If
you do not
understand the
material, go to the
website!
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Kelsey
walked 90 meters in 10
seconds. What was her average
speed?
9 m/s
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Sarah
swam 500m in 30 sec.
How many meters per
second did she swim?
16.7 m/s
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James
was training to be on
the football team. He would
time himself as he ran
around his neighborhood.
He knew his neighborhood
was 1 Km long and could run
around it in 60s. What was
his average speed?
0.017 km/s
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“Sketch that Graph”
 Follow
1.
2.
3.
the 3 steps:
Draw the x-axis and yaxis
Label the x-axis as time,
and the y-axis as
distance
Sketch the graph!
“Sketch that Graph” #1
Jessie left the house and
walked to the movies at a
slow leisurely pace.
She stayed for the movie,
then began walking home
again at a leisurely pace.
Half way home it began to
pour, so she ran the rest
of the way home. Sketch
the graph of her motion.
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“Sketch that Graph” #2
A
jogger runs for 10 minutes at 3.5
mph, for 45 minutes at 6 mph and
cools down for 5 minutes at 2.5 mph.
Sketch a graph of the joggers
horizontal motion.
“Sketch that Graph” #3
A
grizzly bear
meanders slowly
through the meadow,
stops when he smells
some fragrant berries,
then continues on his
way. Sketch the graph
of this motion in the
horizontal direction.
“Sketch that Graph” #4
Brittany
was driving at
60 mph and crashed
into a tree. One hour
later, an ambulance
came and took her to
the hospital at 80 mph.
After her checkup, she
was ok and took a taxi
home at 50 mph.
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Exit Slip
What is the difference between speed and
velocity?
A Smart Car and a Mustang had a race. The
Smart Car had an average speed of 60 mph.
The Mustang had an instantaneous speed
of 120 mph. Which car won the race?
https://www.youtube.com/watch?v=pvbF6k
DhWyU