[First Maximize this Window. [Wait until the applet loads completely {you will see a message down in the status bar at the bottom of this window saying "Applet Animator started"} before pressing [Start] button.]
Note on Buttons: When buttons are discussed in the text below they will be shown with the word enclosed by brackets all bolded. So the "play button" will be indicated by [play] .
A ball moves under the influence of gravity which acts downward (negative y direction) with an acceleration as is shown to the left of the graph window in m/s 2.
The Clock Time is shown in the upper left corner of the graph. Time = 0 coincides with pushing the [play] or the [Start].
If you press the [pause] to temporarily stop the motion, you can then [step>>] or [<<step] through the motion one frame at a time. This allows you to easily determine the position of the ball at any time. Press the [reset] to set the time back to the beginning (Time=0).
You can change the initial conditions for the projectile with the input windows on the left side of the graph. However you must press the [Uptate] below them to make these changes effective. The velocity vector is blue but its x and y components are black. The acceleration vector is green . Scroll down so that all of the graph and the buttons below it are visible.
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