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More Bridge Building

Which parts of these framework bridges are in tension and which parts are in compression?

Bridge Builder

Age 16 to 18 Challenge Level:

Think about why at least one of the joints necessarily feels a net force for the following diagram:

Once you have understood the principles involved with this piece of the framework you can try gradually to fill in the entire framework with compressions and tensions. Can you do this consistently? If so, what can you say about the net forces at each of the pin joints?