Presentation on theme: "Structure Strength Lecturer: Professor Stephen T. Thornton."— Presentation transcript:
Structure Strength Lecturer: Professor Stephen T. Thornton
Reading Quiz Stress refers to A)a device used by policeman to catch speeders. B)force per unit area. C)ratio of the change in length to the original length. D)the change in length of rod by a hanging weight. E)stable equilibrium
Elasticity; Stress and Strain Stress is defined as the force per unit area. Strain is defined as the ratio of the change in length to the original length. The elastic modulus is equal to the stress divided by the strain:
Conceptual Quiz: Five forces of the same magnitude act on a square that can rotate about point P at the midpoint of the bottom edge. Rank the forces (in increasing order) acting on the square according to the magnitude of the torque they create about point P.