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For more information, please see full course syllabus of AP Physics B
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Lecture Comments (1)

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Post by peter alabi on April 9, 2014

in the example on cart on a circular cart why cant we set the Fnet equal to zero such as (mgcosdelta-fn=0)

Conservation of Energy, Part 1

  • A system is isolated if it does not exchange energy with its surroundings.
  • The total energy of an isolated system is constant in time.
  • Energy may be transformed from one form to another. For example, potential energy may be transformed to kinetic energy.
  • When a block is attached to one end of a spring and set oscillating, then at any one instant in time the system will have a kinetic energy K given by (1/2)(mass)(velocity squared) and an elastic potential energy U given by (1/2)(force constant k)(displacement from equilibrium, squared). But the sum K+U remains constant; it does not change as time goes by.

Conservation of Energy, 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
  • Total Energy of an Isolated System 0:13
    • Example: Object in an Empty Space
    • Force Applied on an Object
    • Hot Object t in Vacuum
    • Hot Object Placed in Cold Water
    • Isolated System (Conservation of Energy)
    • Example: Earth and Object (Isolated System)
  • Energy May be Transformed from One Form to Another 13:05
    • Forms of Energy
    • Example: Earth Object System
    • Example: Object Falls from Height h (Transform of Energy)
    • Example: Object Moving on a Rough Surface
  • Spring-Block System: Horizontal System 20:52
    • Example: System of Block & Spring
    • Conservation of Energy
    • Velocity of Object at Any Point
  • Spring-Loaded Gun Shot Upwards 29:02
    • Example: Spring on a Surface Being Compressed
  • Speed of Pendulum 37:43
    • Example: Object Suspended from Ceiling with String
    • Swinging the Pendulum at Angle ø From Rest
  • Cart on a Circular Track: Losing Contact 45:47
    • Example: Cart on Circular Track (Frictionless)
    • When Does the Cart Lose Contact
    • Setting Fn=0 When an Object Loses Contact
    • Velocity of anObject at Angle ø (Conservation of Energy)
  • Extra Example 1: Mass on Track to Loop
  • Extra Example 2: Pendulum Released from Rest
  • Extra Example 3: Object Dropped onto Spring