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A truss is a lightweight and durable structure, all elements of which work in compression or tension, and do not work in bending. In the video, we make several bridges from an A4 sheet of paper and test them for strength. Keywords: statically determinate system, tensile work, compression work, structural mechanics, strength of materials. Thank you for your interest in our work! You can get access to additional materials in our telegram channel: https://t.me/getaclass_channel If you like what we do, we will be very grateful for your support, we have collected all available and convenient tools for sending one-time donations and subscribing in one link: https://sponsorship.getaclass.ru Novosibirsk State University, Faculty of Physics, NSU https://www.nsu.ru/