Pendulums

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# Pendulums - PowerPoint PPT Presentation

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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Presentation Transcript

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
• caused by a restoring force that is directly proportional to the objects displacement
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 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 Pendulum
• Frequency:
• The number of complete cycles in a period of time
• Symbol: f
• Unit: 1/s or Hertz
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

T=2Π(l/g)1/2

l= length

g=acceleration due to gravity