The Random effects lets you put a random seed on some qualities like acceleration, speed, rotation speed, and position. There's also a Seed value in the Baker, but you may only want to make one particular aspect of the system random. This effect gives you control over the randomness of a particular property.
Lets you rename the node.
An on/off switch using binary code. 1 = on, 0 = off.
Lets you choose a parameter to make random: None, Acceleration, Speed, Rotation Speed, and Position.