The algebraic concepts and major ideas that govern Newton's laws of motion can often be a challenge for the majority of ninth-grade students. Therefore, to make learning these concepts less task-oriented and more enjoyable, the author developed lessons that allow students to construct and express their understanding of these ideas through cartooning. This article describes cartooning as an alternative activity in high school physical science, where students are able to demonstrate understanding of Newton's laws of motion through cooperative learning and differentiated instruction. (Contains 2 figures.)