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Pendulums. General Physics. Periodic Motion. A motion that is regular and repeating Examples Circular motion Mass bouncing up and down on a spring Pendulums. Simple Harmonic Motion (SHM). motion that returns an object to its rest position

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Pendulums

  • General Physics
periodic motion
Periodic Motion
  • A motion that is regular and repeating
  • Examples
    • Circular motion
    • Mass bouncing up and down on a spring
    • Pendulums
simple harmonic motion shm
Simple Harmonic Motion (SHM)
  • motion that returns an object to its rest position
  • caused by a restoring force that is directly proportional to the objects displacement
measuring the motion of a pendulum
Measuring the Motion of a Pendulum
  • Bob:
    • the mass that at is hung on the end of a string that makes up the pendulum
    • measured in kg
  • Length:
    • Measured from point of attachment to center of bob in the rest position.
    • measured in meters
measuring the motion of a pendulum1
Measuring the motion of a pendulum
  • Rest position:
    • Also known as the equilibrium position
    • Located at bottom of swing
  • Period:
    • the time for one complete cycle (forward and back to same position)
    • symbol: T
    • unit: seconds
measuring the motion of a pendulum2
Measuring the Motion of a Pendulum
  • Frequency:
    • The number of complete cycles in a period of time
    • Symbol: f
    • Unit: 1/s or Hertz
measuring the motion of a pendulum3
Measuring the Motion of a Pendulum
  • Amplitude:
    • The maximum displacement from the rest position.
    • Symbol: A
    • Unit: m
    • We will measure the amplitude of a pendulum by using a protractor to measure the degrees that the bob is pulled back from the rest position.
equation to find period
Equation to find Period

T=2Π(l/g)1/2

l= length

g=acceleration due to gravity