{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture17 - Statics(II More examples with friction Internal...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Physics 1D03 - Lecture 17 Statics (II) Serway 12.3 More examples with friction Internal forces in simple structures Practice problems: Chapter 12, Problems 47, 51, 52. Physics 1D03 - Lecture 17 If there is no friction at the floor, a ladder cannot lean against a vertical wall in equilibrium, even with friction at the wall. Does the problem change if the ladder leans against the top of the wall? What does the free- body diagram look like? θ A B μ A = 0 μ B w
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 Physics 1D03 - Lecture 17 Example: rolling a spool. inner radius a, outer radius b = 2 a μ s = 0.60 at both surfaces If the spool has weight w = 100 N, what minimum force P is needed to rotate the spool? b a C B A P Plan: Assume the spool is not rotating ( still in equilibrium ) but is about to slip (so f s = μ s N at each contact). Use the conditions for equilibrium, and the two friction equations, to solve for P . Physics 1D03 - Lecture 17 1) Free-body diagram: b a C B A b = 2 a w = 100 N μ s = 0.60 y x 2) Equilibrium equations: F x : F y : torques about C: 3) about to slip:
Image of page 2
3 Physics 1D03 - Lecture 17 b
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern