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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (3)

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Post by Catherine Lin on January 28, 2015

Thank you very much for these videos. They are a great help!

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Post by Nick Longendyke on October 3, 2011

if there is ever future examples, please use numbers. Not using numbers can make it challenging to figure out how you are deriving certain formulas

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Post by Kyle Lumague on July 26, 2011

On the Extra Example 1, I don't understand where you get the 3/4T1 after you get 40/3.

Circular Motion, Part 1

  • If an object attached to the end of a string moves in a horizontal circle, the other end being fixed, the tension in the string provides the necessary centripetal force.
  • In a conical pendulum, the horizontal component of the tension provides the necessary centripetal force, while the vertical component balances the weight of the object.
  • For a car negotiating a curve on a horizontal road, static friction provides the necessary centripetal force. If the car goes too fast so that the centripetal force exceeds the maximum value of the force of static friction, the car will skid.
  • Roads are sometimes banked (raised at an angle) so as to lessen the dependence on static friction in providing the necessary centripetal force.

Circular Motion, Part 1

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
  • Object Attached to a String Moving in a Horizontal Circle 0:09
    • Net Force on Object (Newton's Second Law)
    • Force on an Object
    • Tension of a String
  • Conical Pendulum 5:40
    • Example: Object Attached to a String in a Horizontal Circle
    • Weight of an Object Vertically Down
    • Velocity And Acceleration in Vertical Direction
    • Net Force on an Object
  • Car on a Horizontal Road 16:09
    • Net Force on Car (Net Vertical Force)
    • Frictionless Road
    • Road with Friction
    • Maximum Speed of Car Without Skidding
  • Banked Road 28:13
    • Road Inclined at an Angle ø
    • Force on Car
    • Frictionless Road
    • Road with Friction
  • Extra Example 1: Object Attached to Rod with Two Strings
  • Extra Example 2: Car on Banked Road
  • Extra Example 3: Person Held Up in Spinning Cylinder