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Physics

Physics. Physics Tutoring T uesday: 2:15pm – 3:15pm. 5-Minute Warm-Up. OBJECTIVE : Identify forces acting on an object, and draw a FREE-BODY diagram of all the forces acting on an object . Describe Newton’s First Law in your own words. Free Body Diagrams.

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Physics

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  1. Physics Physics Tutoring Tuesday: 2:15pm – 3:15pm

  2. 5-Minute Warm-Up OBJECTIVE: Identify forces acting on an object, and draw a FREE-BODY diagram of all the forces acting on an object. Describe Newton’s First Law in your own words.

  3. Free Body Diagrams (1) Draw a diagram of just the object (free body) (2) Identify the forces acting on the object and the direction that they push or pull. (3) Draw and label vector arrows for all forces acting on the object. (4) Contact forces are drawn from point of contact, Long Range forces are drawn from the center. (5) Pushes are drawn with arrows facing the object, pulls are drawn with arrows away from the object.

  4. Types of Forces Force of Gravity (or WEIGHT) • Long Range Force • equal to the mass of the object time acceleration due to gravity (W = Fg = m*ag) • ON EVERY OBJECT ON EARTH • Always pulls straight down

  5. Types of Forces Normal Force (resting on a surface) • Contact Force, and an OPPOSING force, which can’t move an object. • Only pushes up with the same amount of force pulling or pushing down on it. • “Normal” means (perpendicular) to the surface.

  6. Types of Forces Applied Force • Contact Force • Any force that is applied by an external interaction. • CAN BE IN ANY DIRECTION. Push or Pull.

  7. Types of Forces Friction Force • Contact Force, and an opposing force against motion across a surface • Parallel to surface and opposite possible motion. Drags or pulls on objects. • Force is from zero up to a maximum. ZERO if no other horizontal force.

  8. Types of Forces Tension Force • Contact Force. Caused by ropes or string or cables. • Can only pull in the direction of the rope.

  9. Types of Forces Electro-Magnetic Forces • Long Range Force • Magnet-Metal – Pull only • Magnet-Magnet – Push or Pull

  10. Types of Forces Spring Forces • Contact Force • A variable opposing force depending on how much the spring is compressed or stretched. • If compressed, a spring will push. If stretched, it will pull.

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