Newton 2D for Windows
This freeware program presents a moving graphical simulation
of a system of up to ten bodies that obey Newton's laws in a
two-dimensional universe. You can get a feel for orbital
mechanics, watch Jupiter perturb the orbit of an asteroid,
design your own planetary systems, and spend many hours
watching the evolution of multi-body systems.
One Hypothetical System
The mass, velocity and position of up to ten objects can be
specified individually. A rudimentary circular orbit
calculator aids in the preliminary setup of a universe.
The Object Editor
The observer's point of view can be moved, rotated, zoomed
and locked to any object. Simulations may be saved and
recalled.
This application is free for non-commercial use and
distribution. See the "Obtaining and Distributing" section of
the help file. The current distribution package will normally
be available from ftp://ftp.tesp.com/pub/Newton2D/