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Your browser can't run 1.0 Java applets, so here's a picture of the window the program brings up:
How to change parameters?
Set the initial position
Click and drag the left mouse button
The horizontal position of the pendulum will follow the mouse
Animation starts when you release the mouse button
dragging the pointer (while > holding down the left button)
from the support-point (red dot) to a position that sets the length you want.
Animation starts when you release the mouse button
Click near the tip of the red arrow,
and drag the mouse button to change it (up-down).
Click near the buttom of the black stick,
and drag the mouse button to change it (up-down).
Information displayed:
1. red dots: kinetic energy K = m v*v /2 of the bob
2. blue dots: potential energy U = m g h of the bob
Try ro find out the relation between kinetic energy and pontential energy!
3. black dots (pair) represent the peroid T of the pendulum
move the mouse to the dot :
will display information for that dot in the textfield
Click show checkbox to show more information
blue arrow(1): gravity
green arrows(2): components of gravity
red arrow (1): velocity of the bob
Try to compare velocity and the tangential component of the gravitional force!
The calculation is in real time (use Runge-Kutta 4th order method).
The period(T) is calculated when the velocity change direction.
You can produce a period verses angle ( T - X ) curve on the screen,
just started at different positions and wait for a few second.
Any suggestions! Please click hwang@phy03.phy.ntnu.edu.tw
Check out other physics java applets
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