This book contains graphs showing data from multiple tests of force and stress on model-size building materials including balsa wood and plywood. In this book, beams and plywood are tested for breakage, the strength of several glues are compared, several models of roof trusses are compared for strength, and blocks are pushed on a wood surface. These data can be used for lesson plans by teachers and parents. Bonus Material: Diagrams of trusses and pictures of broken beams and trusses provide additional material for analysis.