Situation 1 - A small dam of height h = = 2.2 m is constructed of vertical wood beams of thickness t = 120 mm, as shown in Figure S01-0321. Consider the beams to be simply supported at the top and bottom. Assuming that the weight density of water is 9.81 kN/m³. 17. Determine the maximum shearing stress in the beam in MPa. A. 0.198 EO C. 0.147 D. 0.321 B. 0.256 18. Determine the maximum bending stress in the beam in MPa. A. 3.214 C. 2.792 B. 2.248 D. 2.587 B Figure S01-0321

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System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.