Of the top of my head, F is a cause, W is a descriptor.
1) Saying that F is a cause seems to imply that ma is the
corresponding effect ... right?
2) Is that always true? Do you know of any exceptions?
3) Suppose that in a certain situation, the students believed that
ma should be considered the cause and F considered the effect.
How would you persuade them to change their minds? Is there any
actual evidence that in general, F is the cause and ma is not?
4) Can you give a scientific definition of "cause" and "effect"?