Ch 5. Rigid Body Equilibrium Multimedia Engineering Statics 2-D and3-D Supports Equilibriumin 2-D Equilibriumin 3-D Indeterminate Objects 2 and 3 Force Members
 Chapter 1. Basics 2. Vectors 3. Forces 4. Moments 5. Rigid Bodies 6. Structures 7. Centroids/Inertia 8. Internal Loads 9. Friction 10. Work & Energy Appendix Basic Math Units Sections Search eBooks Dynamics Fluids Math Mechanics Statics Thermodynamics Author(s): Kurt Gramoll ©Kurt Gramoll

 STATICS - CASE STUDY Problem Graphic 1) Rough Surface Contact (no slip) Introduction In the lesser-known tale of the Trojan Cow, the would-be invaders of a castle attempt to cross the moat while hidden in the belly of a giant, wooden gift-cow. To cross the moat, an engineer wedges a wooden bridge between the walls of the moat. What is known: The cow exerts a resultant vertical force at a distance d from the left edge of the bridge. There are three ways the bridge can be wedged against the walls of the moat: 1) The bridge is in contact with the rough surface of the walls on each end. 2) The bridge has smooth surface on both ends which allows slipping (similar to a roller). 3) The bridge is in contact with the rough surface of the walls on one end, and has a smooth surface on the other. 2) Smooth Surface Contact (slip) 3) Smooth and Rough Surface Contact Question Which method of laying the bridge will enable the engineer to determine the reactions at the supports? Approach When the bridge is in contact with the rough surface of the moat wall, a support force is exerted with components parallel and perpendicular to the surface of the wall. When the bridge has a smooth surface (similar to a roller) on the end, a support force is exerted only perpendicular to the wall. Evaluate the problem in 2-D.

Practice Homework and Test problems now available in the 'Eng Statics' mobile app
Includes over 500 problems with complete detailed solutions.
Available now at the Google Play Store and Apple App Store.