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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (2)

1 answer

Last reply by: Vasilios Sahinidis
Sat Aug 13, 2011 8:15 AM

Post by malika eradi on February 21, 2011

why Fn is down on the top?

Circular Motion, Part 2

  • If a jet moves in a vertical path, the centripetal force on the pilot is determined by a combination of the pilot’s weight and the normal force exerted by the seat.
  • For an object attached to one end of a string and moving in a vertical circle, a combination of the weight of the object and tension in the string provide the necessary centripetal force.

Circular Motion, Part 2

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Normal Force by a Pilot Seat 0:14
    • Example : Pilot Rotating in a Circle r and Speed s
    • Pilot at Vertical Position in a Circle of Radius R
    • Net Force on Pilot Towards Center (At Bottom)
    • Net Force on Pilot Towards Center (At Top)
  • Object Attached to a String in Vertical Motion 10:46
    • Example: Object in a Circle Attached to String
    • Case 1: Object with speed v and Object is at Bottom
    • Case 2: Object at Top in Vertical Motion
    • Object at Angle ø (General Position)
    • 2 Radial Forces (Inward & Outward)
    • Tension of String
  • Extra Example 1: Pail of Water in Vertical Circle
  • Extra Example 2: Roller Coaster Vertical Circle
  • Extra Example 3: Bead in Frictionless Loop