# EQUILIBRIUM OF A RIGID BODY

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1 CHAPTER Engineering Mechanics: Statics College of Engineering Department of Mechanical Engineering Tenth Edition EQUILIBRIUM OF A RIGID BODY 5c by Dr. Ibrahim A. Assakkaf SPRING 2007 ENES 110 Statics Department of Mechanical Engineering University of Maryland, Baltimore County Slide No. 1 Rigid Body Equilibrium in 3-D (Sections ) Lecture s Objective: Students will be able to a) Identify support reactions in 3-D and draw a free body diagram, and, b) apply the equations of equilibrium. In-Class Activities: Collect homework Reading quiz Applications Support reactions in 3-D Equations of equilibrium Concept quiz Group problem (Ex. 2) Attention quiz 1

2 Reading Quiz Slide No If a support prevents rotation of a body about an axis, then the support exerts a on the body about that axis. A) couple moment B) force C) Both A and B. D) None of the above. 2. When doing a 3-D problem analysis, you have scalar equations of equilibrium. A) 2 B) 3 C) 4 D) 5 E) 6 Applications Slide No. 3 Ball-and-socket joints and journal bearings are often used in mechanical systems. How can we determine the support reactions at these joints for a given loading? 2

3 Applications (cont d) Slide No. 4 The weights of the fuselage and fuel act through A, B, and C. How will we determine the reactions at the wheels D, E and F? A 50 lb sign is kept in equilibrium using two cables and a smooth collar. How can we determine the reactions at these supports? Slide No. 5 Support Reactions in 3-D (Table 5-2) A few examples are shown above. Other support reactions are given in your text book (Table 5-2). As a general rule, if a support prevents translation of a body in a given direction, then a reaction force acting in the opposite direction is developed on the body. Similarly, if rotation is prevented, a couple moment is exerted on the body by the support. 3

4 Important Note Slide No. 6 A single bearing or hinge can prevent rotation by providing a resistive couple moment. However, it is usually preferred to use two or more properly aligned bearings or hinges. Thus, in these cases, only force reactions are generated and there are no moment reactions created. Slide No. 7 Equilibrium Equations in 3-D (Section 5.6) As stated earlier, when a body is in equilibrium, the net force and the net moment equal zero, i.e., F = 0 and M O = 0. These two vector equations can be written as six scalar equations of equilibrium (EofE). These are F X = F Y = F Z = 0 M X = M Y = M Z = 0 The moment equations can be determined about any point. Usually, choosing the point where the maximum number of unknown forces are present simplifies the solution. Those forces do not appear in the moment equation since they pass through the point. Thus, they do not appear in the equation. 4

5 Slide No. 8 Constraints for a Rigid Body (Section 5.7) Redundant Constraints: When a body has more supports than necessary to hold it in equilibrium, it becomes statically indeterminate. A problem that is statically indeterminate has more unknowns than equations of equilibrium. Are statically indeterminate structures used in practice? Why or why not? Improper Constraints Slide No. 9 Here, we have 6 unknowns but there is nothing restricting rotation about the x axis. In some cases, there may be as many unknown reactions as there are equations of equilibrium. However, if the supports are not properly constrained, the body may become unstable for some loading cases. 5

6 Example 1 Slide No. 10 Given:The cable of the tower crane is subjected to 840 N force. A fixed base at A supports the crane. Find: Reactions at the fixed base A. Plan: a) Establish the x, y and z axes. b) Draw a FBD of the crane. c) Write the forces using Cartesian vector notation. d) Apply the equations of equilibrium (vector version) to solve for the unknown forces. Example 1 (cont d) Slide No. 11 r BC = {12 i + 8 j 24 k} m F = F [u BC ] N = 840 [12 i + 8 j 24 k] / ( ( 24 2 )) ½ = {360 i + 24 j 720 k} N F A = {A X i + A Y j + A Z k } N 6

7 Example 1 (cont d) Slide No. 12 From EofE we get, F + F A = 0 {(360 + A X ) i + (240 + A Y ) j + ( A Z ) k} = 0 Solving each component equation yields A X = 360 N, A Y = 240 N, and A Z = 720 N. Example 1 (cont d) Slide No. 13 Sum the moments acting at point A. M = M A + r AC F = 0 i j k = M AX i + M AY j + M AZ k = M AX i + M AY j + M AZ k i j = 0 M AX = 7200 N m, M AY = N m, and M AZ = 0 Note: For simpler problems, one can directly use three scalar moment equations, M X = M Y = M Z = 0 = 0 7

8 Concept Quiz Slide No The rod AB is supported using two cables at B and a ball-and-socket joint at A. How many unknown support reactions exist in this problem? A) 5 force and 1 moment reaction B) 5 force reactions C) 3 force and 3 moment reactions D) 4 force and 2 moment reactions Concept Quiz (cont d) Slide No If an additional couple moment in the vertical direction is applied to rod AB at point C, then what will happen to the rod? A) The rod remains in equilibrium as the cables provide the necessary support reactions. B) The rod remains in equilibrium as the ball-and-socket joint will provide the necessary resistive reactions. C) The rod becomes unstable as the cables cannot support compressive forces. D) The rod becomes unstable since a moment about AB cannot be restricted. 8

9 Example 2 Slide No. 16 a) Draw a FBD of the rod. Given: A rod is supported by a ball-and-socket joint at A, a journal bearing at B and a short link at C. Assume the rod is properly aligned. Find: The reactions at all the supports for the loading shown. Plan: b) Apply scalar equations of equilibrium to solve for the unknowns. Example 2 (cont d) Slide No. 17 A FBD of the rod: A Z z B Z A y x A X 2 kn B X y F C 1 kn Applying scalar equations of equilibrium in appropriate order, we get M Y = 2 (0.2) F C ( 0.2) = 0 ; F C = 2 k N F Y = A Y + 1 = 0 ; A Y = 1 k N M Z = 2 (1.4) - B X ( 0.8 ) = 0 ; B X = 3.5 kn 9

10 Example 2 (cont d) Slide No. 18 A FBD of the rod: A Z z B Z A y x A X 2 kn B X y F C 1 kn F X = A X = 0 ; A X = 1.5 kn M X = 2 ( 0.4 ) + B Z ( 0.8) + 1 (0.2) = 0 ; B Z = 0.75 kn F Z = A Z = 0 ; A Z = 1.25 kn Attention Quiz Slide No A plate is supported by a ball-andsocket joint at A, a roller joint at B, and a cable at C. How many unknown support reactions are there in this problem? A) 4 forces and 2 moments B) 6 forces C) 5 forces D) 4 forces and 1 moment 10

11 Attention Quiz (cont d) Slide No What will be the easiest way to determine the force reaction B Z? A) Scalar equation F Z = 0 B) Vector equation M A = 0 C) Scalar equation M Z = 0 D) Scalar equation M Y = 0 11

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