Forces at the same point: assembly, dismantling, balance. Forces without a common point: assembly, pairs of forces – moment. Reduction of forces: system of forces in a point, the projection of moments onto any axis. Structural elements: classification, grading loads, supports, ties, degrees of freedom. Internal forces and load moments. Trusses. Contact friction. Stress vector and stress tensor. Principal stresses. Planar and uniaxial stress state. Mohr’s circle. Strains, definition. List of experimental procedures for measuring strain. Strain tensor, the plane strain condition. Tensile testing. Hooke’s law. Temperature influences. Geometric characteristics of cross-sections. Symmetric and asymmetric bending. Eccentric bending. Shear stress. Distribution of shear stress in symmetrical cross sections. Unhindered torsion. Torsion of circular cross-section. Torsion of open and closed thin-walled cross-sections. Assembled loads.