The challenge
Can a single sheet of paper support a stack of coins?
What you need
- Two books of equal height
- A4 paper
- Coins or small identical weights
Safety first
Adult guidance is recommended for younger children; keep small items away from very young children.
Before you begin
What do you predict will happen? Write down your idea before trying it.
Step by step
- Place two books 12 cm apart.
- Lay a flat sheet across the gap. Add coins one at a time to the middle and record the result.
- Fold a fresh sheet into an accordion shape, keeping the same span.
- Repeat with the same coins and compare the results.
What did you notice?
Compare your prediction with what happened. What changed between the first and second attempt?
Why it works
Folds change the shape of the paper, making it resist bending more effectively. The exact result depends on the span, paper and how the load is placed.
If it doesn’t work
Check your setup, measurements and materials. Make one change at a time and try again. Results can vary.
Try next
Try changing the width of the folds.