HigherEd 2.0

Here we consider force and moment equivalence in the context of distributed loads. I have written the equations slightly differently here than I did in lecture, so if you took good notes in class you now have to slightly different views of the process. In the end, the key point is that the […]

 

 Lecture 8: Distributed Loads: Play Now | Play in Popup | Download

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Another classic! This lecture deals with equivalence, but first it introduces the notion of moment calculations and specifically couple moments. There is a derivation right in the middle on why the couple moment is independent of the point around which we calculate it (hint: it’s only a function of the relative position […]

 

 Lecture 7: Couple Moments: Play Now | Play in Popup | Download

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This is a good one about the scalar triple product. Especially the last two or three slides. The main point is that the dot product and cross product can work together as a fairly powerful team to get you the information you need about moment action around a particular axis. Enjoy.

 

 Lecture 6: Scalar Triple Product: Play Now | Play in Popup | Download

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This is from Wed. 9/3. We cover dot products and some particle equilibrium. By far the most important thing we discussed is something not recorded here: how to construct good FBDs. We will certainly review this again on Friday, but it’s worth your time to consider the last few minutes of […]

 

 Lecture 4: Dot Products and Particle Equilibrium: Play Now | Play in Popup | Download

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Today we looked at some vector mechanics, and probably the most important concept to come out of today is this: each component of the vector has a very specific physical meaning…a meaning which gives you clues about how to check your work. The two problem we did in class both had some built-in […]

 

 Lecture 3: Vector Mechanics: Play Now | Play in Popup | Download

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As promised, I recorded a short narration of the lecture slides on centroid and moment of inertia, specifically in the context of problem 9-57. You have seen this twice in lecture (not recorded), so he is the archival version for you. Once more time, here are the important part:

Always start by making […]

 

 Lecture Module 40, November 30 2007: Play Now | Play in Popup | Download

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This is the introduction to friction, and before the lecture today we did some small experiments. We introduced the notion of multi-valued STATIC friction, in which the sticking friction force assumes a value just large enough to ensure equilibrium–no more and no less. The video below illustrates this point using the classical inclined […]

 

 Lecture Module 29, November 5 2007: Play Now | Play in Popup | Download

 

 Demo: inclined plane friction experiment: Play Now | Play in Popup | Download

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This module only includes some clarifications on cable analysis from the confusion I generated in class last Wednesday. Actually, the bad mojo surrounding cables continued after this recording, and the result is that we will restrict all future cable problems to those involving “case 1″–cables with point loads and straight line segments.

 

 Lecture Module 28, November 2 2007: Play Now | Play in Popup | Download

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Not sure if this was a trick or a treat, but it least it wasn’t as scary as this. We introduced cables (for example, something like this) and focused on two different types of problems. First, we looked at cables with concentrated loads, along the lines of problem 1 on exam 1. […]

 

 Lecture Module 27, October 31 2007: Play Now | Play in Popup | Download

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We went through parts of this lecture very quickly in class today, so I sort of feel compelled to explain the derivation of those derivative/integral relationships a little better. So the video which accompanies the lecture sort of describes this in more detail and hopefully takes some of the mystery out of the math. […]

 

 Lecture Module 26, October 29 2007: Play Now | Play in Popup | Download

 

 Derivation: derivative relationships among w(x), V, and M: Play Now | Play in Popup | Download

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