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Unformatted text preview: 9/11/2006 ENGR 111  Track A 1 Calculating Reaction Forces in a Truss Class 05 9/11/2006 ENGR 111  Track A 2 Learning Objectives When you complete this module you will be able to Calculate the xy components of a force given its magnitude and angle. Find unknown forces by using the equations of force equilibrium. Write the Procedure for calculating the Torque (or Moment) of a force around a point. This information will be useful in future courses: ENGR 221, CVEN 305, etc. 9/11/2006 ENGR 111  Track A 3 Finding Force Components F1 F2 F3 Ex_05_01 Individually : Consider an eye bolt acted upon by the forces shown: Find X and Y components of the 20 kN force. Repeat for the 30 kN force. Have you seen similar problems in your math or physics homework? 9/11/2006 ENGR 111  Track A 4 Solution: Method 1 Force: 20 @ 40 to positive xaxis : 1 20cos40 15.32 ; 1 20sin 40 12.86 ; = = = = x y kN F kN F kN Force: 30 @70 to xaxis : 2 30cos70 10.26 ; 2 30sin 70 28.19 ; x y kN negative F kN F kN =  =  = = F1 F2 F3 9/11/2006 ENGR 111  Track A 5 Finding Force Components Ex_05_02 Individually : consider the two force vectors shown here and find their X and Y components. How did you find the signs of the components? Solution: Part a) 5 lb force points in the positive direction of xaxis, and in the positive direction of yaxis. That means both F x and F y will be positive....
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This note was uploaded on 04/27/2009 for the course ENGR 111 taught by Professor Walker during the Spring '07 term at Texas A&M.
 Spring '07
 walker

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