Trusses Ex 08: Determine the force in members EF, AF, and DF of the space truss.

To determine the forces in members EF, AF, and DF of the space truss and check whether they are in tension or compression, you would typically proceed by:
Identify the structure: First, observe the geometry and configuration of the truss. Determine the joints and members, paying attention to how the supports are provided at points A, B, D, and E (since they are short links, they will resist forces along their axis).
Analyze external reactions: Use equilibrium equations for the entire truss to calculate the reaction forces at the supports. Apply the three equilibrium equations:
∑F x=0 (sum of forces in the horizontal direction)
∑F y=0 (sum of forces in the vertical direction)
∑M=0 (sum of moments around a point)
Method of joints: Break the truss down into individual joints and apply equilibrium equations at each joint. You can assume that:
If the member force pulls the joint, it's in tension. If the member force pushes the joint, it's in compression. For each joint, apply:
∑F x=0
∑F y=0
∑F z=0 (since this is a space truss)
Solve for the forces in members EF, AF, and DF: After finding the reaction forces and solving equilibrium equations at the relevant joints, you will determine the forces in these members.
Reference Book: Hibbeler engineering mechanics statics 14th edition

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