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Int: 6 th Session: ENGINEERS MECHANICS ENGINEERS MECHANICS STATICS STATICS CHAPTER6CHAPTER6 Lecture Notes: Professor A. Salam Al-Ammri Suhad Ibraheem Mohammed Al-Khwarizmi College of Engineering University of Baghdad Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad 2/17/2012

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Int: 6 th Session: Contents 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: Impending Tipping vs Slipping 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: Impending Tipping vs Slipping 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: M o =0 :- P h + W x =0, x = P.h/W Impending Motion (F s = s N) If (x < l / 2) then block will slide. If (x = l / 2) then block is unstable. If (x > l / 2) then block will tip. In Motion (F k = k N) F s becomes F k, s > k, F s > F k Impending Tipping vs Slipping 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: The drum has a weight of 100 lb and rests on the floor for which the coefficient of static friction is ms = 0.5. If a = 3ft and b = 4ft determine the smallest magnitude of the force P that will cause impending motion of the drum. Sample Problem /17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: If each box weighs 150 lb, determine the least horizontal force P that the man must exert on the top box in order to cause motion. The coefficient of static friction between the boxes is μ s = 0.35, and the coefficient of static friction between the box and the floor is μ s = 0.65 Sample Problem Free Body Diagram:There are possible motion,namely(1)the top box slides,(2) both boxes slide together as a single unit on the ground,and (3) both boxes tip as a single unit a bout point B. Assume both boxes tip as a single unit about point B.Thus,x=1.5 ft. 2/17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: Since F

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Int: 6 th Session: The mass of refrigerator is 110 kg. It is supported at A and B.The distance h =1520 mm and b = 360 mm. The coefficient of static friction at A and B is 0.2. (a)What is the force F is necessary to impending slip? (b)Will the refrigerator tip over before it slips? Sample Problem /17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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Int: 6 th Session: N is less than N. So it will not tip. Check to see if the refrigerator will tip over, the forces at A would disappear and NB would hold the entire weight of the refrigerator. Sample Problem /17/2012Professor Dr. A.Salam Al-Ammri & Suhad Ibraheem Mohammad

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