Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Zero is the net force acting on an object when two equal forces are applied from opposite directions.
What is the net force acting on an object when two equal forces are applied from opposite directions?

The term amines is used to describe molecules that contain carbon-nitrogen bonds.
What term is used to describe molecules that contain carbon-nitrogen bonds?

The cerebellum of the brain lies under the cerebrum and behind the brain stem.
What part of the brain lies under the cerebrum and behind the brain stem?