Free tool

Bridge Builder

Build a bridge from beams, cables and struts, then send a truck across and watch every piece: red is being pulled, blue is being squashed, grey is carrying almost nothing. Five challenges, each teaching one idea about structures. Runs in your browser — nothing uploaded, no account.

1 · First crossing

Small truck 20

Get the truck over. Start by laying a road straight across — then test it and watch what happens. Fixing what you see is the actual task.

0 pieces

being pulled (tension)being squashed (compression)along for the rideThicker = carrying more.

Drag between grid dots to place a piece. Tap a piece to remove it.

Teaching structures? Browse example units or put this in a lesson with StudioLoom, where students' builds are saved and their test results become evidence.