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PHY221 Ch5: Forces and FB Diagram

PHY221 Ch5: Forces and FB Diagram. Recall main points: Forces and FB diagrams Discussion and examples. PHY221 Ch5: Forces and FB Diagram. Main Points. Forces: Gravitational Force. Expression:. Miracle of mass (inertia) and gravitational mass:.

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PHY221 Ch5: Forces and FB Diagram

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  1. PHY221 Ch5: Forces and FB Diagram Recall main points: Forces and FB diagrams Discussion and examples

  2. PHY221 Ch5: Forces and FB Diagram Main Points Forces: Gravitational Force Expression: Miracle of mass (inertia) and gravitational mass: Weight: Grav force at SURFACE of EARTH

  3. PHY221 Ch5: Forces and FB Diagram Main Points Forces: Empirical forces Contact Forces: Normal and Tension Other Forces: Spring restoring force

  4. PHY221 Ch5: Forces and FB Diagram Main Points Free Body Diagrams and example of problems Box Pushed Up an Incline at constant velocity (q=30o m=200kg; What is the push needed?)

  5. PHY221 Ch5: Forces and FB Diagram Discuss Person in elevator at a. What is the reading on the scale?

  6. PHY221 Ch5: Forces and FB Diagram Discuss Car goes in curve of R=25m at v=5m/s. Find tension in string holding fuzzy die?

  7. PHY221 Ch5: Forces and FB Diagram Discuss • Summary: Force problems • Picture: Free Body Diagram: • Identify all forces acting on m: Tension, normal, weight, others… • Draw the forces on m from origin in object: direction is usually known but mag unknown (tension, normal, etc…) • Choose axes x and y: always take un axis // acceleration if a is not zero. Otherwise (v=cst) choose axes to facilitate projection of forces on axes. • Write all vector in terms of mag, angle expressions. • Write F=ma along each axes in terms of previous result • Solve

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