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Pendulums. Starter. What is the equation that links time period, T, and frequency, f? T = 1 /f or f = 1 / T What affects the frequency of a simple pendulum? Mass, length, how much it swings? Just length! Why did grandfather clocks have pendulums?

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Presentation Transcript
starter
Starter
  • What is the equation that links time period, T, and frequency, f?

T = 1 /f or f = 1 / T

  • What affects the frequency of a simple pendulum? Mass, length, how much it swings?

Just length!

  • Why did grandfather clocks have pendulums?

They kept constant time, independent of amplitude or mass

  • What would happen to a pendulum on the moon?
pendulums1
Pendulums

Rearrangethe pendulum equation to analyse their motion

Investigatethe relationship between length and time period

Identifythe factors that affect the frequency of a pendulum

slide4
Main
  • Using the worksheet to help you, set up the equipment safely and record your measurements in an appropriate manner.
  • Collect the second sheet to guide you through the rest of this investigation.

Warning – take care that the retort stand is set up safely and will not topple over.

slide5

T2

  • ‘T2‘ is proportional to ‘l’ because
  • This means that the only two factors that affect the time period of a pendulum are the length and the strength of gravity.
  • The mass and how far is swings back and forth do not affect it since they are not in the equation.

l

pendulums2
Pendulums

Rearrangethe pendulum equation to analyse their motion

Investigatethe relationship between length and time period

Identifythe factors that affect the frequency of a pendulum

plenary 1
Plenary - 1
  • As an astronaut who has just landed on another planet, how could you measure the strength of gravity using common items found on a space craft?

g = l x 4π2 / T2

plenary 2
Plenary - 2
  • You own a fairground, and want to build a giant swing that is 10m high. To ensure it is safe enough for the thrill seekers you need to know the frequency.
  • How would you calculate this and what would it be?

0.16 Hz