Education Technology

# Activities

• ##### Subject Area

• Science: Middle Grades Science: Friction
• Science: Physical Science: Friction

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™

TI Connect™

• ##### Accessories

CBL™/CBL 2™
Sensor - Dual Range Force
TI Connectivity Cable

• ##### Other Materials
This is Activity 8 from the EXPLORATIONS Book: Activities for Middle Grades Science with the CBL 2™ and TI-73.

The following materials are required for this activity:
• Wooden block with screw attached
• String
• Different surfaces
• Meter stick/measuring tape

## Frictional Forces

#### Activity Overview

In this activity, students' will use a Dual range force sensor to measure the force required to pull a block across different surfaces. They will examine the results to see when more force is needed to move the block and understand the role of frictional force on motion.

#### Before the Activity

• Connect the force sensor into channel 1 of the CBL 2
• Start the DataMate™ program
• See the attached PDF file for detailed instructions for this activity
• Print pages 67 - 72 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to your class.

• Complete the Hypothesis section on the Data Collection and Analysis page and predict the force required to move the block on different surfaces

• Position the wooden block on the surface to be tested
• Pull the block across the surface for a set distance over 5 seconds
• Repeat the procedure three times
• Find the average force needed to pull the block across the surface
• Repeat the activity for other surfaces
• Identify which surfaces decrease and increase friction force
• #### After the Activity

Students' will complete Student Data Collection and Analysis Sheet.

Review student results

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