The $F=ma$ competition is the largest physics competition in the United States, and took place online the afternoon after this Meta question first appeared. It is a multiple choice exam with tricky mechanics problems.
In the past, Math.SE has had problems with cheating on similar competitions. Please be on the lookout and do not blindly answer mechanics questions, especially if they are clearly screenshotted from an online exam. Many $F=ma$ questions are conceptual in nature and thus would not be closed under the homework policy, but they should not be answered until at least $2$ hours after posted, when the exam has ended.