Review of interatomic and intermolecular forces and bonds. Crystal structure, amorphous structure. Structural imperfections, concepts of force, stress, deformation and strain. Mechanical properties of materials: elasticity, plasticity, viscosity, introduction to rheological concepts. Properties related to strength: stress-strain curves, true stress and true strain, ductility, brittleness, toughness, resilience and hardness. Fracture, fatigue and creep concepts.