My daughter wanted to study Physics--and an elementary level Physics course is NOT an easy thing to find! We used this Chemistry/Physics course for her in 4th grade, and she loved it! It is very simple to understand, yet really gave her a good introduction to the Physics she was interested in. Guess what? After going through this book she is even MORE interested in Physics, so I look forward to doing the Apologia high school level Physics class with her soon!