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Free Body Diagram

Free Body Diagram. 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?. 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?

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Free Body Diagram

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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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