the truss shown, a- Identify all zero force members by drawing a cross (X) at the center of each zero force member you identify. b- Find the forces in members AF Indicate if in tension or compression.

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Use the method of sections to determine the internal force in member EF of the truss. Use + for tension; use - for compression. Use the method of sections to determine the internal force in member BF of the truss. Use + for tension; use - for compression. Use the method of sections to determine the internal force in member BC of the truss. Use + for tension; use - for compression. Use the method of sections to dete ine truss. Use + for tension; use - for compression. internal force in member AB of the 1 m 2 m 6 KN 8 KN 2 m B E 2 m 2 m

The signboard truss is designed to support a horizontal wind load of 660 lb. If the resultant of this load passes through point C, calculate the forces in members BG and BF. The forces are positive if in tension, negative if in compression. 660 lb Answers: BG= BF= i i -8' B E 8' G +4'H 9' 9' b 9¹ lb lb