Each group needs:

• pan scale
• plastic water bottles (recycled) filled with sand (varied amounts per group)
• Making Robots Work Worksheet, one per person
• Robot Quiz, one per person

Each class 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
• bag of playground sand
• paper or plastic funnel (a rolled-up piece of paper can be used to make a funnel)
• roll of masking tape
• yard stick or tape measure
• black marker

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 NXT 2.1 software