Assume the velocity of water is ,

the speed will increase as it fall a height h, and , where is the gravity.

The amount of water is proportional to which is a constant.

When the water speed , it's radius become smaller.

Assume is the initial radius, then

Modeling activity:

Try to drag the yellow square to fit with the shape of the water stream, by adjusting initial radius of the stream and initial speed of the water.

**Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop.**This work is licensed under a Creative Commons Attribution 2.5 Taiwan License

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