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- Move the suspension point with the mouse to start the oscillations. Notice
- how the oscillation amplitude decreases due to friction. You can vary the
- amount of friction using the F7 and F8 keys. Use F3 and F4 to decrease or
- increase the length (L) of the pendulum and F5, F6 to change the
- gravitational acceleration (g). To time the oscillations use the timer
- displayed in the upper right corner. Use F9 to turn the timer on, to turn
- it off and to reset it.
-
- Find out whether the period (T) depends on the amplitude of oscillation
- for amplitudes smaller than, say, 20 degrees. What happens to the period
- for much larger amplitudes? What is the effect of changing g and L ? How
- does T change? For example, what happens when g or L are made 4 times
- smaller or larger? See what the pendulum would do if g were negative.
-
- Try to verify the law of pendular motion for small oscillation amplitudes:
- ┌────────────────────────────┐
- │ T = 2 * pi * sqrt( L/g ) │
- └────────────────────────────┘
- Measure and plot T as a function of L and of g. To get a good measurement
- of T, time a large number of oscillations and divide the time by that
- number. Do your experimental results agree with theory? Is there a formula
- for large amplitude pendular oscillations? Try to find it and to verify it.