
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 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.
Read aloud, take turns, or pause for a question. The illustrated page-by-page reader is above.
Page 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
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
Ivy curved a new sheet into a gentle arch. It held three animals, then its sides spread when she added a fourth.
Page 4
For the third test, Ivy folded paper back and forth like an accordion. The many ridges made several small supporting walls.
Page 5
The accordion bridge slipped from one tower. Ivy added small paper tabs that hooked over both tower edges.
Page 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
Ivy repeated each test with the same tower gap and the same animals. Her chart showed flat one, arch three, accordion seven.
Page 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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