Download Save to Drive ADD TO FAVORITES Hide lower priority columns Add to Folder creative writing children's book activities classroom tools language arts and writing vocabulary Create new folderCREATE NEW FOLDER SHARE Grade: 6 7 8 9 Subjects: Social Studies and History Middle Ages Science + show tags Themes: Inventors and Inventions Type: Worksheets Holidays: Mathematics Education Month This cross-curricular unit on catapults has students focusing on controlling variables while testing and modifying classroom catapults.