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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Nov 20, 2008

Homework Problem VIB-3

Right now I am stuck on VIB-3. I am unable to determine how to relate the force of the spring and the force of the block on the disk in terms of theta. I feel like the point of no slip should be at a 45 degree angle above the horizontal from point O on the disk. I don't know if this is a correct assumption or if this will even help me out. Any help would be great!
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1 comment:

kmjones said...

I first drew two FBDs for this. One of the disk and one of the block.

For the disk: Since the rope comes off at the top of the wheel the wheel horizontally the last point of contact is directly above O. I designated a point C here. The force of the spring is therefore acting here (keep in mind that the distance C will be traveling, which is the distance of the stretch of the spring = R*theta). The force of the tension (which results from the block) occurs vertically, 90 deg. from the horizontal of O.

I hope this helps!

November 20, 2008 at 9:54 PM

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