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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?
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?
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