You will be given a definition of a task first, then some input of the task.
Given a scientific passage and an answer, generate a question for the given answer.

Passage: In a wheel and axle, force may be applied either to the wheel or to the axle. In both cases, the direction of the force does not change, but the force is either increased or applied over a greater distance. Answer: direction
Output:
In a wheel and axle, when force is applied either to the wheel or axle, what aspect of the force does not change?