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Ivy Finds the Strongest Paper Bridge

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8 pages to explore
Cover illustration for Ivy Finds the Strongest Paper Bridge.
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Part 1

Ivy needed a paper bridge for toy animals to cross between two equal block towers. She used one sheet for every test and counted only animals held for five seconds without bending.

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Ivy Finds the Strongest Paper Bridge

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Page 1

Part 1

Ivy needed a paper bridge for toy animals to cross between two equal block towers. She used one sheet for every test and counted only animals held for five seconds without bending.

Page 2

Part 2

The first sheet lay flat across the gap. It held one wooden animal for five seconds, then bent when Ivy added a second.

Page 3

Part 3

Ivy curved a new sheet into a gentle arch. It held three animals, then its sides spread when she added a fourth.

Page 4

Part 4

For the third test, Ivy folded paper back and forth like an accordion. The many ridges made several small supporting walls.

Page 5

Part 5

The accordion bridge slipped from one tower. Ivy added small paper tabs that hooked over both tower edges.

Page 6

Part 6

She added animals one at a time and counted aloud. The folded bridge held seven, then its center bent when she added an eighth.

Page 7

Part 7

Ivy repeated each test with the same tower gap and the same animals. Her chart showed flat one, arch three, accordion seven.

Page 8

Part 8

Ivy learned that changing a material's shape can change its strength. A fair test helped her compare the bridge designs.

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