Method of Sections Theory
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Video Lecture 64 of 83
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### Lecture Description

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The objectives of this video are to introduce method of sections theory & steps involved in solving for axial forces. First of all, the video presents a simple truss asking to find out the axial forces in 3 arbitrary members. The truss has 7 members and 5 joints and subjected to two axial forces at top joints of the structure. The angles between the members are also given. Moving on, the video shows how to take cuts at arbitrary section and draws the FBD for both the left and right cuts showing the actions of internal forces that result because of the cuts.

Next, the video uses the principle of equilibrium to resolve forces components into x and y direction as well as takes anticlockwise moment at top-left joint to determine the unknown values of the axial forces; thereby finds out the axial forces in three arbitrary members of the given truss. Doing so, the video briefly demonstrates the actions of internal forces in the members and finally refers to watch next video for more complex workouts on method of sections theory.

### 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.