St. Peter's Primary Bray Blog

We have been learning all about teeth in third 🦷 We did an experiment using eggs, because egg shells and teeth are both made of calcium compounds that react similarly to acid (and none of the children fancied having vinegar in their mouth for 3 days in a row). We popped in our eggs and off we went! We filled the glasses with coke, water, vinegar and coffee to see the impact they had on the egg shells. We put two eggs into the coffee, one covered in toothpaste, to see if it would make a difference. The results were: •Water- no change •Coffee (without toothpaste)... 

Fourth class started the year with a great STEM challenge called ‘Design a Bridge’. During this challenge the children tested different bridge models to see which was the strongest. Below you will see the pictures of flat bridges, arched bridges, walled bridges and corrugated bridges. We made this a fair test by all using the same type and amount of books. We also kept the distance between the books at 15cm. Our results found the walled bridge was strong, the arched bridge was stronger and the corrugated bridge was the strongest.