Report a QuestionPlease email hello@efficientengineer.com. Question 57 Statics | Static Equilibrium | difficulty level 1Which equation correctly describes the bending moment M for the section of beam shown in the free body diagram below? The 21 Nm moment and 18 N force are reaction loads at a support located on the left side of the beam. M(x) = -18x M(x) = 21 - 18x M(x) = 21 + 18x M(x) = 18x Report this questionExplanationThe moments in this section of the beam must be in equilibrium. Taking moments about the right-hand side of the beam, we have the 21 Nm reaction moment and a moment equation to 18x, caused by the 18 N reaction force. Both of these moments act in the opposite direction to the bending moment M, so the correct equation must be M(x) = 21 + 18x. LEARN MOREThis topic is covered at 14:17 in the video Understanding Shear Force and Bending Moment Diagrams.Watch the videoYour Results Restart with New Questions Change Quiz Settings Review the Questions
