The Free-Body diagram for joint A is drawn assuming that all internal forces are in tension (even if we know that some of them are in compression). Solve for the force in AB. The force is positive if in tension, negative if in compression.

The Free-Body diagram for joint A is drawn assuming that all internal forces are in tension (even if we know that some of them are in compression). Solve for the force in AB. The force is positive if in tension, negative if in compression.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter6: Beams And Cables

Section: Chapter Questions

Problem 6.6P: Find the internal force systems acting on sections 1 and 2.

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Concept explainers

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.

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The
Free-Body diagram for joint A is drawn assuming that all internal forces are in tension (even if we know that some of them
are in compression). Solve for the force in AB. The force is positive if in tension, negative if in compression.
AB
K
48°
Answer: AB-
i
AC
AD
N

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