Pendulums

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# Pendulums - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Pendulums' - lita

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Presentation Transcript

### 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?

They kept constant time, independent of amplitude or mass

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

Rearrangethe pendulum equation to analyse their motion

Investigatethe relationship between length and time period

Identifythe factors that affect the frequency of a pendulum

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.

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

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
• 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
• 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