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Class 5

# Class 5 - Calculating Reaction Forces in a Truss Class 05...

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9/11/2006 ENGR 111 - Track A 1 Calculating Reaction Forces in a Truss Class 05

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9/11/2006 ENGR 111 - Track A 2 Learning Objectives When you complete this module you will be able to Calculate the x-y 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?

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9/11/2006 ENGR 111 - Track A 4 Solution: Method 1 0 0 0 Force: 20 @40 to positive x-axis : 1 20cos40 15.32 ; 1 20sin 40 12.86 ; = = = = x y kN F kN F kN 0 0 0 Force: 30 @70 to x-axis : 2 30cos70 10.26 ; 2 30sin70 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 x-axis, and in the  positive direction of y-axis. That  means both F x  and F y  will be  positive.

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Class 5 - Calculating Reaction Forces in a Truss Class 05...

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