Gravition Object
Gravity
Gravity is the most commonly used force. With it you can simulate most types of motion including collision. The force exerted on an object by gravity depends on the object’s mass. To switch off gravity for any given object in the dynamics system, set the Mass of the object to 0. This will also switch off wind and drag for the object. Gravity fields are also useful for simulating collision. Although Dynamics includes a collision detection engine, collision via gravity fields can be many times faster.