Abstract: Problem solving is quite important for physics and physics education. Besides, it is essential for students to develop the scientific and analytical thinking processes. These processes can be taught to students with the help of the scientific and analytical thinking. Generally, instructors solve some fundamental quantitative problems regarding the subjects after they teach the subjects in the traditional instruction model. Students also prefer to memorize some solution ways of the problems by using basic equations or formulas concerning the problems instead of learning and understanding the solution ways of the problems. These kinds of approaches do not lead to sufficient learning for the students. Solely, knowing the fundamental equations/formulas are not enough for problem solving. The instructors need to more concentrate on teaching of the qualitative problem solving. Therefore, this study investigated the effects of quantitative and qualitative problems on students' problem-solving performances. The study was conducted with 80 university students. The students were asked four classical physics problems and 20 multiple choice questions in the final examination. The content of classical problems was about “Newton's Laws” and “Work and Energy”. Students' classical physics problem solutions with the help of designed assessment rubric and determined problem solving strategy steps were analyzed and reported. Some suggestions in the light of investigation were presented in the end of the research.