Each group needs:

• LEGO MINDSTORMS EV3 robot, such as EV3 Core Set (5003400) at https://education.lego.com/en-us/products/lego-mindstorms-education-ev3-core-set/5003400#lego-mindstorms-education-ev3
• stopwatch, or other timing device such as a smartphone
• ruler
• Pre-Activity Worksheet, one per student
• Activity Data Sheet, one per student
• Post-Activity Worksheet, one per student

Note: This activity can also be conducted with the older (and no longer sold) LEGO MINDSTORMS NXT set instead of EV3; see below for those supplies:

• LEGO MINDSTORMS NXT Base Set; from this set, the following items are used: the NXT intelligent brick, 1 touch sensor, 2 cables to connect the motors to the brick, wheels of different sizes, and additional LEGO parts
• computer loaded with the NXT 2.1 software

To share with the entire class:

• painter's tape, for marking distances on the ground
• yard or meter stick
• LEGO MINDSTORMS Education EV3 Software 1.2.1, free online, you have to register a LEGO account first; at https://www.lego.com/en-us/mindstorms/downloads/download-software; the software is required to download the attached rbt program to the EV3 brick
• computer, loaded with EV3 1.2.1 software

Note: As an alternative to the LEGO EV3 robot, many other viable alternative robot kits exist that allow you to vary the speed of the motor that controls the wheels. For example: LEGO MINDSTORMS EV2, Parallax Boe-Bot Robot. See the Additional Multimedia Support section for details and links.