PendulumJava Applet
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
- Adjust the length
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
- Change gravity g
Click
near the tip of the red arrow,
and drag the mouse button to change it (up-down).
- Change the mass of the bob
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.