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Understanding Free Body Diagrams in Force Systems

Learn about free body diagrams that represent force interactions in a simplified manner and the classification of force systems. Explore linear, parallel, and concurrent force systems with examples and the polygon method for analyzing multiple forces.

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Understanding Free Body Diagrams in Force Systems

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  1. POLYGON FORCES

  2. FREE BODY DIAGRAM: The free body diagram is a "snapshot" or simplified sketch that represents the interaction between force systems and its environment.

  3. Force systems may be acting on either 1- A single rigid segment: such as the foot. 2-Several segments: such as the head, arms and trunk. These can be regarded as a single rigid system

  4. Force Systems Is a system that describes the relationship between two or more forces. These forces are classified into 1-Linear Force System (Colinear): Acting along the same action line. 2-Parallel Force System (Coplaner): Acting in the same plane. 3-Concurrent Force System: Acting at the same point.

  5. 1-Linear Force System (Colinear): *The forces are acting along the same action line of application. R= F+G+H-L-M F G L M H

  6. 2-Parallel Force System (Coplaner): Acting in the same plane. The forces act at a distance and parallel to each other. It has three subtypes: a) Two not equal forces in parallel same direction. b)Two equal forces in parallel same direction. c) Two not equal forces parallel in opposite direction.

  7. a) Two not equal forces in parallel same direction *Magnitude of resultant. *"R“ Direction of resultant force. *Point of application of resultant.

  8. b)Two equal forces in parallel same direction *Magnitude of resultant. *"R“ Direction of resultant force. *Point of application of resultant.

  9. c) Two not equal forces parallel in opposite direction *Magnitude of resultant. *"R“ Direction of resultant force. *Point of application of resultant.

  10. Polygon method: used in more than two forces • Vectors are oriented in a “ end of first vector (tail) to tip of last vector" • or same cyclic order

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