crafting · 30 seconds
Make a flat sheet stand up with geometry.
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Compare a flat strip with a folded channel using one small coin.
Illustrations generated with OpenArt. Narration uses free local Kokoro neural voices. Illustrations are visual aids; the written lesson carries the explanation.
Hold a paper strip between two supports. A flat strip bends easily under a small central load.
Flat strip
Fold the long edges upward into a shallow channel. Keep the same paper and support spacing.
Same paper · new shape
The folded shape places some material farther from the bending centre, changing its bending stiffness.
Shape changes stiffness
Use identical sheets, spans and loads. Compare the deflection; paper direction and creases also affect the result.
Same load · same span
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