Primary 3 Testing our Truss Bridge

We finished making our truss bridges this week in Primary 3. How strong do you think a bridge made from lollipop sticks held together with glue will be? We decided to test one of the bridges using dictionaries as weights. Some of us thought the bridge would only hold three dictionaries. Some of us thought it would hold as many as six!

Eleven dictionaries and then we ran out of dictionaries!! We thought about why the truss bridge was so strong and how our knowledge of triangles as strong shapes helped. When we eventually broke the bridge by testing to see if it could hold someone’s weight, we thought about what we could do to make the bridge even stronger.

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