Math behind the applet:

    This applet solves the ordinary differential equation (ODE)  for a pendulum.

            d w / d t = - Sin( q ) - w*Q + A Sin(2 t / 3 )

            d q / d t = w

            d t / d t = 1

Tips on working the applet:

    The reset button resets the graph and the time on the animation panel.

    To change the initial values of the pendulum fill in the respective text field with the value       

    needed. 

            Friction and  amplitude should range from 0 to 2.

            Initial Angle (angle) and Initial frequency( frequency) can be anything.                                                            

    To plot different graphs just click on the respective button:

                ang. vs t:  The position of the pendulum in radians vs time.

                w vs t:      The position of the pendulum in angular velocity of the pendulum vs time

                angle vs w:The position of the pendulum in radians vs the angular velocity of the pendulum (phase plot)    

To view Documentation for the code click on the following link:   Documentation

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