Each group needs:

• 1 or 2 ping pong balls (or other lightweight ball)
• masking tape (to mark the ground)
• 1 Student Worksheet for each group member

For the entire class to share:

• a curtain to hide someone launching a ball in the second-to-last round, or a separate space such as a hallway, where the last round can take place unobserved by the class
• a whiteboard with marker or projector or other large screen connected to a computer, on which to record input and output values for the final round