You could use a bigger test mass, like a grain of dust. It doesn't even matter how big the test mass is, so long as it's small compared to the kilogram. It'll get deflected precisely the same amount.

I find the best way to deal with school is to completely ignore your surroundings, including your teachers, and instead teach yourself as much as you possibly can about computers. If you have the intelligence necessary to be a hacker, you'll pick up tidbits in class, do well on exams and tests, and pull average marks. As an added bonus, you won't get into these situations! Of course, I'm assuming that most hackers are like me (i.e. they prefer to teach themselves rather than be taught).

--Skatche; the name with no meaning whatsoever
"If you're going through hell, keep going."
Winston Churchill