# Activities

• • • ##### Subject Area

• Science: Physical Science: Newton's Laws
• Science: Physics: Dynamics

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition
• TI-84 Plus C Silver Edition
• TI-84 Plus CE
• ##### Software

TI Connect™
TI Connect™ CE

• ##### Accessories

CBR™/CBR 2™
TI Connectivity Cable

• ##### Other Materials
This is Activity 7 from the EXPLORATIONS Book: Math and Science in Motion: Activities for Middle School.
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Walk the Line #### Activity Overview

In this activity, students' will create constant-speed motion plots and develop linear equations to describe them mathematically.

#### Key Steps

• Distribute the pages to your class.

• Place the CBR on a table and stand 0.5 m away from it
• Walk away from the CBR at a slow and steady pace
• Examine the distance versus time graph
• Record the coordinates and calculate the slope and the starting y- intercept
• Perform a linear regression and compare the slope and the intercept values
• Students create a distance-time graph made by walking at a constant rate in order to find the mathematical equation that duplicates the plot.

• Students use the guess-and-test method to find the equation of the line that matches their data.

• Students use linear regression to gauge the accuracy of their calculations of the slope using the coordinates of two data points.