Illustration 1.3: Getting Data Out

Animation 1 Animation 2

Please wait for the animation to completely load.

In Illustration 1.2 you learned about units and how to click-drag in an animation to get the position of objects.  In this Illustration we will discuss several other ways in which data is depicted in animations.  Restart.

Select Animation 1 to begin (position is given in meters and time is given in seconds).  Shown in the animation is a red ball that, when you press the play button, will move across the screen in a predefined way.  Along with the red ball are depictions of the object's position: an on-screen numerical statement of position, a data table, a graph, an arrow,  and ghost images.  You may of course click-drag in the animation to measure position as well.

Why all of these different representations?  Select Animation 1 or reset the animation and play it again.  Notice how the different representations of the motion change with the motion of the ball.  With a lot  of practice physicists are able to look at the motion of objects and tell you the various properties of the motion.  How do we do that?   Mentally we have different pictures in our heads.  Specifically,

We never set up an animation to give you all of these depictions of motion simultaneously as we have done above.  We usually pick one or two representations that best depict the phenomena.  Select Animation 2 (position is given in meters and time is given in seconds) to see the depictions of velocity.

Note that this, and most, animations depict motion that started before the animation begins and continues beyond the time that the animation ends.  In the animations on this page, the ball always has, and always will, move to the right at 3 m/s. 

When you get a good-looking graph, right-click on it to clone the graph and resize it for a better view.



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