Lesson 1 of 19
Fold it, cut it, crumple it
Show on a big screenFold a sheet into a boat. Open it again. It is still paper.
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The idea
Step 1 of 4
- One flat sheet: 432 cm², 4 g.
- Folded twice the same way: 4 layers.
- Cut straight across the stack.
- Opened out: 5 pieces. Still 432 cm², 4 g.
A physical change changes shape, size or form. No new substance is made.
The rule
To crumple is to squeeze paper into a ball.
Folding and cutting change the shape. The paper stays paper. No new substance is made.
| What you do | What changes | What stays the same |
|---|---|---|
| Fold it | Its shape | Paper, 432 cm², 4 g |
| Cut it | How many pieces | Paper, 432 cm², 4 g |
| Crumple it | Its surface | Paper, 432 cm², 4 g |
Try the lab to finish this lesson.