My 7th graders never do their physics homework. They have my class once a week, so they have an entire week to do their homework. I was so upset last week, that I told them this weeks homework would count as a project grade. I told them that "I don't understand" is not an excuse as they have an entire week to come to me during breaks and ask questions. Not a single kid completed it (their excuse- I didn't understand), and 3 (out of a class of 12) didn't do it at all. And you know what? I'm not giving extra chances. Those 0s are going in the grade book and their grade is going down. They're lazy and they need to learn a lesson.