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## Pendulums

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**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