1 / 11

ME 221 Statics Lecture #37 Sections 8.1 – 8.3

ME 221 Statics Lecture #37 Sections 8.1 – 8.3. Homework #12. Chapter 8 problems: 1, 2, 4, 8 & 15 Due Today. No Class Friday, December 5. Quiz #8. Today Friction problem. Final Exam. Section 1 (3:00pm) Monday, 12/8, 3:00 – 5:00pm Section 2 (12:40pm) Wednesday, 12/10, 12:45 – 2:45pm

illana-christensen
Download Presentation

ME 221 Statics Lecture #37 Sections 8.1 – 8.3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ME 221 StaticsLecture #37Sections 8.1 – 8.3 Lecture 36

  2. Homework #12 Chapter 8 problems: • 1, 2, 4, 8 & 15 Due Today Lecture 36

  3. No ClassFriday, December 5 Lecture 36

  4. Quiz #8 Today Friction problem Lecture 36

  5. Final Exam Section 1 (3:00pm) Monday, 12/8, 3:00 – 5:00pm Section 2 (12:40pm) Wednesday, 12/10, 12:45 – 2:45pm See University policy for multiple exams Lecture 36

  6. Chapter 8 - Friction • Last Lecture • Coulomb Friction • Coefficients – static & kinematic • Friction angle • Today • Wedges Lecture 36

  7. Coulomb Friction (dry friction) • Friction force (ƒ) is proportional to the normal force (N) and opposes motion • Coefficient of friction, m, is the proportionality constant f • Static coefficient, ms msN • Kinematic coefficient, mk mkN W f=P P f P N Lecture 36

  8. Friction: Wedges • Wedges are a simple means for lifting • Again, friction force opposes the motion • FBDs are essential for solving problems • Apply equilibrium equations to FBDs Lecture 36

  9. Friction: Wedges • Wedges may exert large normal forces • Used to lift heavy objects • Also used for splitting • Friction holds wedge in place • May be used in pairs Lecture 36

  10. Wedges • The angle θ is called the wedge angle, and it determines the amount of force P required to raise the weight W, as well as the change in height of the weight as the wedge is driven into place. W • In equilibrium (P = 0): • ƒ cos θ – N sin θ = 0 • μs = tan θ P f N  Lecture 36

  11. Example Problem Lecture 36

More Related