• What models do you remember building?
• Which ones worked best for you?
• Would you like to build any of them again?

• Watch the video. What kinds of relay races do you see?
• How can you move an object without touching it with your hands?
• What ideas do you have for a relay race?

• Invent something that can use a push or a pull to pass the ‘baton’ without using your hands.
• Sketch your idea, then build it.
• Use parts of the models that You have built before or invent something new.

• Test your model with your partner. Is there anything you should change?
• Get ready for the class relay race!
• On your mark, get set, go!

• How did you do?
• Explain how your model works.