Maybe you’ve seen marble races. This is sort of the opposite. How long can you make a marble take to roll across a table? What is the longest, slowest route? Participants can explore and tinker as they try to make a marble (or any rolling sphere) take as long as possible to roll across a surface.

MATERIALS NEEDED

• Any flat surface (table, board, desk)

• Marble (or any rolling ball)

• Various household or classroom objects

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