Create the Graph

1
Create the Graph!

• Functional Relationships between two variables

2
Walk the Graph!
The graph below shows the distance in meters
between you and a wall over a 10 second time
period.   The horizontal axis represents the
time and the vertical axis represents the
distance.   Write a description of what the graph
depicts
3
Using the CBR

• Link the CBR 2 motion detector directly into the
  TI-84 Plus. You can use either the I/O
  Unit-to-Unit cable or the mini-USB cable.
•  
• Set the sensitivity switch to Normal mode.
•  
• Turn on your graphing calculator.
•  
• The Easy-Data App will launch automatically if
  the mini-USB cable is used. If you are using the
  I/O unit-to-unit cable, you will need to press
  the ? key, scroll down to highlight the EasyData
  App and press ? to launch the App.

4
Using the CBR Review

• Setting up the calculator for data collection 
• Select Setup (press ?) to open the Setup menu.
• Press 2 to select 2 Time Graph to open the Time
  Graph Settings screen.
• Select Edit (press ?) to open the Sample Interval
  dialog window.

5
Using the CBR Review

• Enter 0.1 to set the time between samples to 1/10
  second.
• Select Next (press ?) to advance to the Number of
  Samples dialog window.
• Enter 50 to set the number of samples to collect.
• Select Next (press ?) to display a summary of the
  new settings.
• Select OK (press ?) to return to the main screen.

6
Instructions

• One member of the group will need to hold the
  calculator while the other member holds the CBR
  2 unit. The third member of the group will be
  walking in a straight line toward to team member
  holding the CBR 2 unit. You can walk forwards
  and backwards towards the unit.
•  
• You may produce better graphs if the person
  walking holds a book in front of them as they
  walk. This helps to smooth out the motion on the
  calculator.
•  

7
Instructions

• Select Start (press ?) in the main screen to
  start collecting data at the same time you tell
  the team member to go.
•  
• Let each team member take turns walking, holding
  the calculator, and controlling the CBR 2 unit.
•  
• Sketch each group members graph on the empty
  graphs provided.

8
Using the CBR - Debrief

• Describe how your graph reflects the way you
  walked when creating the graph.
• How is your distance from the CBR reflected on
  the graph?
• Walking away from the CBR
• Walking toward the CBR
• Stopping
• What does the origin represent on your graph?
• What do the x and y-axes represent?

9
Your description might look like the following

• Start 1 meter away from the CBR. Walk slowly
  away from the CBR for about 3 seconds, stand
  still for about 5 seconds, and then walk quickly
  toward the CBR for 2 seconds.

10
Debrief

• What does the graph look like when you walk
  toward the CBR2? Why?
• What does the graph look like when you walk away
  from the CBR2? Why?
• What does the graph look like when you stand
  still? Why?
• Describe the relationship between distance and
  time.
• What is the association of distance and time with
  the horizontal axis and the vertical axis?

11
Mathematical Terms

• Independent Variable
• Dependent Variable
• Origin
• Slope

12
What letters of the alphabet can you create?

• For this activity you may choose to use the CBR2
  or not. Complete the questions on your activity
  page.
• NOTE A partner will be needed if you choose to
  use the CBR2 for this activity. Record your
  partner on your paper.