2) A simply supported timber beam with a rectangular cross-section has been loaded perpendicular to its longitudinal axis with several loads along its length. The grain of the timber is along the length of the beam (Figure a & b). Failure occurs at the support through approximately the centre of the rectangular cross-section (Figure c). What causes this failure? Considering the internal loading, the type of stresses, and their location of occurrence, explain with 3 sentences, maximum.

The properties of materials can be classified into the following categories: Mechanical Physical Thermal Electrical Magnetic Describe each category, include two specific properties in the description and say why those properties are of interest to a design engineer.

engineering stress, o CO b) Offset (x) 1. Which material has the highest yield strength? 2. Which material has the highest ultimate tensile strength? 3. Which material has the lowest tensile modulus (aka Young's modulus)? 4. Which material has the highest toughness? c) engineering strain, & 5. What offset (x) in engineering strain () should be used to calculate the yield strength? a. 2 b. 0.2 c. 0.02 d. 0.002 e. 0.0002