Hypothesis: The factors that I think will affect the period of the pendulum are the displacement and the suspended mass because if the mass of the bob is a lot than it will take more force for the pendulum to swing and if there's a high displacement it will give the pendulum more energy to complete the cycle.

2. Start the string at a length of 130cm.(control)

3. Attach a 200g bob(control) to the bottom of the string.

4. Make the displacement 30cm by pulling the bob 30cm away from the center. Do this with a meter stick.

5. Let go of the bob and allow one full cycle before starting the stop watch.

6. Stop the stop watch after the bob returns.

9. Now repeat steps 1-7 with a length of suspension of 130cm,170cm, and 210cm. The controls are a bob of 200g and a displacement of 90cm.

Source- Exploring Physical Science, 1997, page 13.

controls- displacement 90cm, length of suspension 130cm

How Displacement Affects the Period of a Pendulum

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Approximate Word count = 670
Approximate Pages = 3 (250 words per page double spaced)