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Does the beam that holds the rafters together reduce the force pushing the walls apart, or does it increase it? This question is not at all simple, and we invite you to watch several experiments and then think about it yourself. Keywords: structural mechanics, strength of materials, strength of materials, statically indeterminate system, deformation of thin beams. Thank you for your interest in our work! You can get access to the supplemented materials and support us in our telegram channel: https://t.me/getaclass_channel/525 or the Boosty service: https://boosty.to/getaclass