Method of Sections
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Video Lecture 27 of 83
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Date Added: July 18, 2015

### Lecture Description

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The objective of this video is to introduce method of sections for finding internal forces in members. The method of sections is converting external forces into internal forces at arbitrary points. At first, the video shows a simply supported beam having a fixed support at left end and a roller support at right end. The video, then, asks to find out the internal forces at point x means the axial force, shear force and bending moment of that point. The point x is basically an arbitrary point located x meter away from the left end of the given exemplary beam.

The method of section allows cutting the beam at the selected arbitrary point & separated the beam into two different parts. Moving on, the video shows the two cuts of the beam and elaborates what internal forces are developed due to the cuts at respective section of the given beam. Next, the video completes the FBD diagram of the respective sections & later shows the equilibrium conditions for left cut of the beam. Finally, the video refers to watch next video for a workout example.

### Course Description

Mechanics, the study of forces and physical bodies, underpins a very large proportion of all forms of engineering. A thorough understanding of mechanics is essential to any successful engineer. This course helps develop an understanding of the nature of forces with consideration for how they may be simplified in an engineering context. The conditions of equilibrium are then used to solve a number of problems in 2D and 3D before moving on to a broad range of topics including centroids, distributed loads, friction and virtual work. The course will also provide an introduction to dynamics, with a particular focus on the effects that forces have upon motion.

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