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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

• General Physics

• A motion that is regular and repeating

• Examples

• Circular motion

• Mass bouncing up and down on a spring

• Pendulums

• motion that returns an object to its rest position

• caused by a restoring force that is directly proportional to the objects displacement

• 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

• 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

• Frequency:

• The number of complete cycles in a period of time

• Symbol: f

• Unit: 1/s or Hertz

• 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.

T=2Π(l/g)1/2

l= length

g=acceleration due to gravity

g = 4Π2(length)/T2