home *** CD-ROM | disk | FTP | other *** search
- Move the suspension point with the "arrow" keys to start the oscillations.
- You can also press the space bar to increase the oscillation amplitude.
- 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.
-