NCEES Problem 510 in the
2016 NCEES PE Mechanical: Machine Design and Materials Practice Exam is a classic 2D equilibrium problem involving a mechanical device to hold up a weight by friction based forces. However, the solution presented by the NCEES is incorrect. In the application of one of the equilibrium equations to the free-body diagram of one of the two major pieces, two terms are missing. In the NCEES solution these two terms supposedly cancel when in fact they do not. One the shortfalls of the NCEES solution is that the free-body diagram of the piece in question is not provided. In this Instructional Companion, the Dr. Tom Method provides the necessary free-body diagrams and associated equilibrium equations. Try it on your own first, then watch the video.
Dr. Tom's Solution to NCEES MDM Problem 510
DTC recommends that anyone taking the PE Exam purchase the NCEES
Practice Exam for the exam they are taking. It is an essential exam
review resource.
https://account.ncees.org/exam-prep/
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