Cardboard marble run
Tape tubes to a wall and race a marble from top to bottom.
You'll need
- Cardboard tubes or folded card
- Masking tape
- A marble or small ball
How to play
- Tape the first tube high on a wall at a slope.
- Add tubes and ramps so the marble keeps rolling.
- Test, adjust and test again.
- Add a bucket at the end to catch it.
Try saying this
“What do you think the marble will do?”
Your part
Follow their design, even when it will not work. Share the surprise when the marble flies off, and comment more than you question.
If it stalls
- When it fails, wait. They will often spot what to change before you say a word.
- Build the first ramp together, then let them add the next one alone.
Short on time? One tube, one marble, one roll.
Why it's good for them: Testing and fixing a design builds patience and the habit of trying again.
Not this one? Try track and town, paper cup towers, paper bridge challenge.