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
• 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
• computer, loaded with EV3 1.2.1 software
• 2-3 sheets of copy paper (recycled is fine)

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 robot, such as the NXT Base Set
• computer loaded with the NXT 2.1 software

To share with the entire class:

• robot built from a LEGO MINDSTORMS EV3 kit
• access to a computer
• 1 eraser
• 1 tube of Chapstick®
• 1 tennis ball
• 1-2 gum drops
• 1 paper ball (made of a crumpled piece of printer paper)
• 1 ping pong ball
• tape measure
• scale