Magnetism: Enables Electro Magnetic simulation. Magnetism is different from gravity in that it is a signed quantity: similar charges repel each other, opposite charges attract each other. The four magnetism alternatives - Inactive, Both, Cause, Affected - work the same way as in the Gravity setting above.
Fluid Dynamics: Enables fluid simulation. See 'Gravity' above for the option types. Typically only fluid specialized objects such as a fan have the 'Cause' option set i.e. they generate a fluid environment. Other simulated objects use 'Fluid Dynamics = Affected' option.
Inactive - The object does not collide or make other objects collide.
Both - The object creates collisions and collides itself.
Cause - The object creates a collision impact when hitting other objects. However, it does not react itself to the collision.
Affected - The object reacts to the collision impact. However, it does not change the motion of other objects in a collision.
Collision Accuracy: Defines how accurately the collision point is examined. The higher the value, the sooner collision (= object volume penetrating another object volume) is detected. High values naturally increase computation time. If the object shape is complex (includes sharp extrusions etc.), a high collision accuracy may be necessary to prevent object volume overlapping.