# Pendulums

## Pendulums

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##### Presentation Transcript

1. Pendulums

2. 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?

3. Pendulums Rearrangethe pendulum equation to analyse their motion Investigatethe relationship between length and time period Identifythe factors that affect the frequency of a pendulum

4. 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.

5. 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

6. Pendulums Rearrangethe pendulum equation to analyse their motion Investigatethe relationship between length and time period Identifythe factors that affect the frequency of a pendulum

7. 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

8. 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