|A simple pendulum is just a piece of string, with a mass suspended at one end, which is allowed to swing freely. The Earth's gravity controls |
|how the pendulum swings. |
|Equipment needed: |
|string (at least 1 metre long) |
|mass tied to one end of the string (called a bob) |
|something to suspend the pendulum from |
|stop watch |
|tape measure |
|In the diagram on the right, the dotted line shows the rest position of the pendulum, while the solid line shows the pendulum ready to start |
|swinging. The length of the string is L, and the bob on the end of the string is shown as a red blob. |
|Start by letting the pendulum swing gently (if the string is not taut all the time, you won't get an accurate value for g). The start the stop |
|watch going and time how long it takes to do, say, 10 complete swings (a complete swing is from a given position back to the same position, not|
|just a half swing). Repeat the experiment several times. Does it matter where you start the pendulum swinging? |
|You should find that it doesn't matter and that the pendulum... [continues]
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