The purpose of this model is to demonstrate what a gravity field looks like in 2D if one has several massive objects. One can place these objects freely, and then watch a distribution of small masses be pulled toward them.

For detailed instructions on using the program, take a look at the info window from the Gravity model.

Download the StarLogoT source code for the Gravity model:
Download gravityfields

To run this file you need StarLogoT2002 for the Macintosh.
(download StarLogoT)

Click on one of the pictures to see a quicktime movie of the model: