All you need to simulate our physical World.

If you select the PARTICLE button from the CONTROL window you can proceed to create a new particle. Edit or delete an existing particle.
CREATE - PARTICLE
Supply a name for the new particle in the name field
Type the initial position and velocity of the particle.Type the value for its mass.
Type coefficients for the velocity and force displayed vectors. These coefficients are used only for display purposes.Type the color for the trace of the particle.
Finally select the QUANTITY button to create edit or delete any quantities the particle will have.
EDIT -PARTICLE
Select an existing particle from the list. Then edit any parameter of the particle.
DELETE - PARTICLE Select an existing particle from the list. Then select the DELETE button

If you select the QUANTITY button from the PARTICLE dialog window you can proceed to create a new quantity for a selected particle. Edit or delete an existing quanity for a selected particle.
CREATE - QUANTITY
Supply a name for the new QUANTITY in the quantity field.
Type its value in the value field.
EDIT - QUANTITY
Select an existing quantity from the list. Then edit its value.
DELETE - QUANTITY
Select an existing quantity from the list. Then select the DELETE button.

If you select the FORCE button from the CONTROL window you can proceed to create a new force. Edit or delete an existing force.
CREATE - FORCE
Supply a name for the new force in the name field
Type the x component of the force.
Type the y component of the force.
Type the z component of the force.
Finally type the name for a quantity.
The particles that will interact using this force must have a quantity that has the same name as the above quantity.
EDIT - FORCE
Select an existing force from the list. Then edit any parameter of the force.
DELETE - FORCE Select an existing force from the list. Then select the DELETE button.