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This video presents a comprehensive example of solving the axial forces in a truss using the method of sections. Very first, the video shows the given truss structure and asks to find the axial forces in 3 arbitrary members. All the necessary dimensions, angles and values of forces subjected to the truss have been given. The video, then, explains the shortcomings of using method of joints to solve this problem and subsequently talks about the advantages of using method of section to solve such type of problem. Moving on, the video determines the support reactions and draw the FBD of the truss.
At second step, the video shows how to take cut through critical members and examines the easier side. The video uses the section right to the cut followed by the drawing of FBD for the considered section showing the actions of axial forces over the FBD. Later, the video establishes equilibrium to find out the unknown values of axial forces and thereby determines the axial forces developed in 3 arbitrary members of the given exemplary truss. This is quite tricky, so do practices to have better understanding on how to use method of sections to solve such type of complex problems.
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.