SIMPLE HARMONIC MOTION: A SPRING PENDULUM
This Java applet demonstrates the variation of elongation, velocity, acceleration, force and energy during the oscillation of a spring pendulum (assumed with no friction).

Note: The "Reset" button brings the pendulum to its initial position. You can start or stop and continue the simulation with the other two buttons. If you choose the option "Slow motion", the movement will be ten times slower. The spring constant, the mass, the gravitational acceleration and the amplitude of the oscillation can be changed within certain limits. In order to select another physical size you have to click on the appropriate radio buttons.

Note:  Click Refresh if the applet does not fully load ...

Can we not design an .activity for participants based on the applet?
For example, to find and test the equation of the function. For the initial distance function I find y = 0,05cos(2t) - but it required several trial and improvements and I learned about amplitude and period in the process.
Of course, I used my graphing calculator to illustrate and check my efforts.
But, of course, we can also ue a tool like our Excel worksheets on y = acos(bx+d) to check our efforts ... (we can easily make one in radians!).
Or we can use our onsite graping applet.
Then change the amplitude ...
And do it for velocity ...

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