Education Technology

Lines, Models, CBR - Let's Tie Them Together

Published on 06/09/2008

Activity Overview

In this activity, students use a motion detector to create the data set and examine the relationship between a physical action and a mathematical and/or graphic model of that action.

Before the Activity

Install the Transformation Graphing application on the students' graphing calculators using one of these two methods:

  • TI-Connect™,  a TI Connectivity Cable, and the Unit-to-Unit Link Cable
  • TI-Navigator™  "send to class" feature
  • Connect the CBR 2™ to the calculator using the Unit-to-Unit link cable
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 17 - 23 from the attached PDF file for your class
  • During the Activity

    Distribute the pages to the class.

    Follow the Activity procedures:

  • Place the CBR on a table
  • Set up the Data Logger App to record one reading every 0.1 second for 6 seconds
  • Walk away from the CBR at a constant rate
  • Study the distance versus time graph
  • Set up a scatter plot of the data and trace it to find the y-intercept
  • Determine the slope, write the equation of the line which best fits the data, and graph it
  • In a second trial, students try to walk and duplicate the model graph
  • In a third trial, students try to walk and match the graph with a negative slope
  • In each trial, students identify how the direction and speed of motion affects the distance versus time plot
  • After the Activity

    Students will complete the Student Worksheet and answer questions listed on it.

    Review student results:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary