A question was asked. That implies a lack of knowledge. Given that lack of knowledge, how is one to know if the question is regarded by people who do have that knowledge as "stupid"?
I wouldn't downvote it, but "Is this also the first real perpetual motion machine?" indicates that the one asking the question is familiar with the terminology, and even knows that all known perpetual motion machines aren't real. If so, in this forum, I think we can assume that (s)he also can google that term and make some deductions from what (s)he finds. It is not as if (s)he does not have Internet access.
"I googled, and found differing opinions on whether perpetual motion is possible. Is this an example that shows that it is?" would be a better question. It still would surprise me that there are people on HN who would pose such a question about such a simple device, but it would show some intelligence and a will to make an effort to learn. The OP still may have both, but the way the question is posed doesn't show it.
