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To keep up to date with Lab_13 Irchester, you can follow what we are doing on our twitter feed @Lab_13Irchester, or on the Lab_13 blog. The lab committee make regular posts to share what we have been up to!

Lab_13 News Updates

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Irchester News: Egg-cellent Egg Strength!

December 4, 2017

This week the lab 13 blog will be about an egg-cellent experiment with egg shells, carried out by the members of Wednesday Science Club as part of their BP Science Explorers challenge. What they discovered was so surprising; we in the committee repeated the experiment to check the results!

The experiment was to test how strong egg shells are, it involved weights and a book. First, we chose three half egg shells that were about the same size and cut straight round. Then we put them in a big triangle and balanced the book on top. Next, we took some weights and placed them top of the book, spacing the weights out evenly. We repeated adding weights until the egg shells broke.

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First science club predicted how much the eggshells would carry. The predictions ranged from 150g to 3kg: most people though the eggshells wouldn’t be very strong. Then they tested them, some eggshells supported 5kg before they broke, and the highest weight was 11.5kg! Everyone found the eggshells were stronger than they thought. As the Committee we wanted to check the results, so we repeated the experiment 3 times: the highest weight supported was 7.9kg, with the lowest being 5.5kg.

We were amazed to discover how much weight the egg shells can carry, much more than our predictions of 4kg. We thought the egg shells would be really weak but they were so strong.

We think egg shell need to be strong to protect the growing animals inside from dying. The eggs could be crushed by the mother sitting on them, or broken if they roll out of the nest, and some predators try to break them open to eat them. The eggshells still need to be thin though, so that the baby animal can break out! The best shape to be strong but thin is… egg shaped! It’s arched just like an arch bridge, which is what we tried making next…

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By Josh (Yr 6) and Hayden (Yr 5)

Posted in: Lab13