Welcome to the website of ME 274 for the Fall 2008 semester. On this site you can view blog posts, add your own blog posts and add comments to existing posts. In addition to the blog are links to course material: course information, information on solution videos, exams, quizzes, homeworks and other course-related material. Direct links to the homework solution videos are also available on the left side of this page.


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Oct 28, 2008

Homework Problem 6/10


Suggestions:
  1. FBD
  2. Newton-Euler equations:  Equation (3) uses the center of mass G for the crate. I recommend using this point.
  3. Kinematics:  Here the crate does not rotate. Therefore, alpha = 0 and aGy = 0, making the RHS of equations (2) and (3) zero.
  4. Solve:  You can get the answer using equations (2) and (3) along with the kinematics above. Check your answers using the logic discussed in lecture. [Here T creates a CCW moment about G. To prevent rotation, NA and NB together must create an equal but opposite (CW) moment about G. What does this say about the relative sizes of NA and NB?]
This problem is very similar to the crate problem that we worked in lecture. Here we have the tension force T = 3000 N; in the lecture problem we had the forces of friction.

Let us know if you have any questions on this.



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Byron said...
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October 29, 2008 at 11:45 AM

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