Simple harmonic motion is the motion of a simple harmonic oscillator. The motion is periodic, as it repeats itself at standard intervals in a specific manner with constant amplitude. It is characterized by its amplitude, its period(the time for a single oscillation), its frequency(the number of cycles per unit time), and its phase(which determines the starting point on the sine wave). The period, and its inverse the frequency, are constants determined by the overall system, while the amplitude and phase are determined by the initial conditions (position and velocity)of that system. (Wikipedia, 2008). The general equation describing simple harmonic motion is
x=Acos(2pft+f
where x is the displacement, A is the amplitude of oscillation, f is the frequency,is the elapsed time, and f is the phase of oscillation.
To create a simple model of simple harmonic motion in VB6 , we use the equation x=Acos(wt), and we have assigned a value of 500 to A and a value of 50 to w. In this program, the circular object which we have inserted into the form will oscillate from left to right, reaching the maximum speed at the middle of the path.
In this program, you have to insert a shape and set it to be a circle in the properties windows. Next, insert two command buttons and change the captions to start and stop respectively. Finally, insert a timer and set its interval to be 1000 and disabled it at start up. We can use the move method to move the shape1 object whose path is determined by the formula x = 500 * Cos(50 * t) . When you run the program, the will move in an oscillating motion as shown in the figure below:
The CodeDim t As Integer 

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