### 3D Apps

Physics models matter and its interactions in a world with
three spatial dimensions. Predictions of the behavior of a particular system in
space are usually in the form of equations. It helps our understanding if we
can visualize these predictions. This is particular important for introductory
physics courses. Often, if we choose the coordinate system appropriately,
two-dimensional visual representations are all that is needed, because either
the system under consideration becomes two-dimensional (example: projectile
motion), or nothing changes as a function of the third coordinate (example: the
gravitational field near Earth's surface). For other system, however,
three-dimensional visual representations can give us a better understanding of
the behavior of the system in three-dimensional space.

The 3D interactive animations below run in any modern
browser. No special plug-ins are needed. Try them out and see if they are
helpful to you. Feel free to link to them.

### Some 2D apps using the 3D library