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Understanding Free Body Diagrams in Physics

Learn how free body diagrams depict net forces on objects, explore scenarios of objects with zero net force, discover types of forces, and practice drawing diagrams in various situations.

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Understanding Free Body Diagrams in Physics

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  1. Free Body Diagram

  2. Free Body Diagram • Used to show all net forces acting on an object • What can an object with a net force of zero be doing?

  3. Example • Draw the free body diagram for a box being acted on by all the following forces: 5N (W), 3N(S), 8N (N), and 7N(E) • Can it be at rest? • Can it be at a constant speed? • What is it doing?

  4. There are Several Types of Forces thatcan act on an Object • Applied Force (Fa) – force applied on an object by another object or person • Gravity (FG)– force of attraction between an object and a large massive body (Earth) - also known as Weight (W)

  5. 3) Normal (FN) – support force exerted on an object by a stable surface - perpendicular to surface of contact - equal but opposite to gravity

  6. 4) Friction (Ff) – force that opposes motion; acts in a direction opposite of motion 5) Air Resistance (Fair) – type of friction caused by air 6) Tension (FT) – force transmitted through a string rope or cable

  7. Drawing Free Body Diagrams • A block rests on the floor. • A block hangs from a rope attached to the ceiling.  • A tractor pulls a loaded wagon with a constant force. Ignore friction. • A book falls to the floor. Ignore air resistance.

  8. 5) A feather floats to the floor at a constant velocity. Consider air resistance. 6) A car travels at a constant velocity 7) A cart initially moving across the floor slows to a stop.

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