Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Linear Functions
• Math: Middle Grades Math: Algebraic Thinking
• Math: PreAlgebra: Nonlinear Functions
• Science: Physical Science: Newton's Laws

6-8

45 Minutes

• ##### Device
• TI-73 Explorer™
• TI-Navigator™

TI Connect™

• ##### Accessories

CBR™/CBR 2™
TI Connectivity Cable

• ##### Other Materials
This is Adventure 5 from the EXPLORATIONS Book:
Adventures in Data Collection with TI-73 Explorer™.

The following materials are required for this activity:
• 5 large basket style coffee filters

## Falling Down - Adventure 5

#### Activity Overview

Students use the CBR 2™ to study how a change in mass affects the average speed of a falling object. They graph distance as a function of time, and interpret and analyze graphs representing motion.

#### Before the Activity

• Connect CBR 2 to the calculator.
• Launch the Ranger application
• See the attached PDF file for detailed instructions for this activity
• Print pages 35 - 36 from the attached PDF file for your class
• Transfer files to student calculators using TI-Navigator™  "send to class" feature
• #### During the Activity

Distribute the pages to your class.

Collect Data:

• Hold the CBR 2 at eye level 0.5 meters directly above the concave side one coffee filter
• Drop the filter and start recording distance - time data
• Graph the data with time on the horizontal axis and distance from CBR 2 on the vertical axis
• Understand what different sections in the graph represent
• Repeat the experiment using 5 filters stacked together
• Examine the Distance-Time plot and see that the stack of 5 coffee filters fell with the highest average speed.
• Increase in mass caused the speed to increase

• TI-Navigator activity:
• Load the activity settings file CBRonFloor.act
• Students mark points to illustrate what the plot of the coffee filters falling would have looked like if the CBR 2 had been placed on the floor and the filters released above it
• Students also redraw for other conditions
• #### After the Activity

Students analyze the results and answer the questions in the worksheet

Review student results:

• As a class, discuss average speed, terminal velocity, and air resistance
• Re-teach concepts as necessary