Driven pendulum (forced oscillation)

This applet created by Prof Hwang
Modified by Ahmed
Original project Driven pendulum (forced oscillation)

There are three springs all driven by external force with different frequency.
The resonance frequency is determined by $\omega_0=\sqrt{k/m}$ where k is the spring constant, m is the mass (k,m can be adjusted with slider).
When sync check box is checked:
The driven frequency for left spring is $ratio*w_0$ ,
The driven frequency for center spring is $w_0$ ,
The driven frequency for right spring is $ratio/w_0$ .

You can find the phase between oscillation and external force.
A damping force is introduced to prevent the amplitude become infinity.

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