Q.3) An airplane wing is supported by a truss structure as shown below. Three vertical forces are applied at points C, D, and E along the upper surface of the wing. Use the Method of Sections to find the force in members BC, CG, and GF. Indicate whether the member is in tension or compression. 2500 lb 3000 lb 1500 lb 8' 8' 8' 8' A #4 -G- H B C D E F 18'

Q: 15 ft P₁ ㅏ IG A 10 ft Q Search P2 F B -10 ft P₂ C 10 ft P₁ D

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.