We used the book "Primary Physics" which we bought at the Roman exhibit in Melbourne a few months ago. Author is Marti Ellen.
I am so fascinated by the way it stays up.....
The ice cube tray has the perfect angles!
We poured plaster of paris into the ice tray.
When set, we gently sanded the blocks with sand paper.
You need an uneven number of blocks to get a 180 degree arch...7,9, 11
the 'foot' or blocks touching the ground need to be sanded further to create a slightinward slant, so the next block will rest on them.
It takes two people, or one carefully holding as my husband did pictured above.
So glad I didn't buy the expensive set of wooden blocks I was looking at!
Seriously...the Roman Arch....I love it!
8 comments:
I am totally receiving your excitement levels down my cancerian pipeline. I am so impressed and am totally going to do this on the weekend with my girls! TOTALLY ;)
Hahahaha you so get me Guammy. xxxxx
This is awesome! We have to try it.
Thank you!! Amazing!
Did you have to coat the ice cube trays with anything before pouring in the plaster?
did the cubes pop out easily?
Did the arch activity come from Marti Ellen's book? I would love to use that in my class.
We didn't coat the trays and the plaster popped right out like ice does! Great activity! I'm glad I found this!
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