Distance
G
F
Time
On the Distance vs Time Graph:
On the Speed vs Time Graph:
Line AB =
Line AB =
Line C =
Line BC =
Line DE =
Line CD =
Line F =
Line DE =
Line G =
Look at the graph about the speed of a train.
Questions:
1. What is missing that would make this an
excellent graph?
2. What is the speed of the train after 1 hour?
3. What is the speed of the train after 3 hours?
4. When the speed of an object stays the same, scientists call it having “constant” speed.
Does the train have constant speed?
Questions:
1. From the graph calculate the speed
of the car at 2 seconds.
2. From the graph calculate the speed
of the car at 4 seconds.
3. From the graph calculate the speed
of the car at 10 seconds.
4. If the car continued on the same path and speed, what would be the distance at 14
seconds?
Questions:
1. Calculate the speed of the car at 2 seconds.
2. Calculate the speed of the car at 4 seconds.
3. Calculate the speed of the car at 6 seconds.
4. What is happening to the speed of the car?
Space for Calculations
Velocity
Knowing an object’s speed is important. But you need more information to describe the
object’s motion completely. For
City
Km from
Number
Velocity
example, if a plane leaves Hobby
Houston
of hours
(speed and
Airport in Houston and flies in a
direction)
straight line at a speed of 750 km/hr, Albany, NY
2848
2
where will it be in 2 hours?
Although you know the plane’s
1282
2
speed you can’t answer that question Atlanta, GA
without also knowing the direction
in which the plane is moving.
Boise, ID
3140
2
The speed of an object moving in a
particular direction is called its
2987
2
velocity. Objects in motion have the Charleston, WV
same speeds but different velocities.
For example, a plane traveling west
1965
2
from Houston to Los Angeles at 750 Cheyenne, WY
km/hr has a different velocity that a
plane flying east from Houston to
Columbia, SC
1617
2
Atlanta.
You have developed a small rocket
Columbus, OH
1880
2
ship that can fly at 1400 km/hr.
Your company wants to decide
which cities you can take passengers Des Moines, IA
1490
2
to in two hours or less.
What To Do:
Hartford, CT
2826
2
1. In the chart there are 14 cities
listed with their distance from
Indianapolis, IN
1650
2
Houston in kilometers. You will
need to calculate the speed (km/hr)
at which the rocket needs to fly to
Jackson, MS
711
2
get the passengers to their
destinations.
2. Determine the direction for it to
Little Rock, AR
698
2
fly so you can determine the
velocity.
Nashville, TN
1260
2
3. Make a dot on the map to show
the location of Houston, TX.
4. To determine the direction use a
Phoenix, AZ
1913
2
ruler to draw a line from Houston to
the named city on the map and use
the compass rose at the bottom of the map to determine which direction the rocket must travel.
Questions:
1. Remember your rocket can only travel at 1400km/hr. Which cities cannot be reached in 2
hours at this speed?
2. The FAA has decided that the airspace in the northeast are too crowded for a rocket ship.
Which cities will you have to take off your route?