No, "physical science" is not one of the three main divisions of science. The three main divisions of science are:

1. Physical Science: This is the study of matter and energy, including topics like physics, chemistry, astronomy, and geology.

2. Life Science (Biology): This is the study of living organisms and their interactions with the environment, including topics like botany, zoology, and ecology.

3. Social Science: This is the study of human behavior and society, including topics like psychology, sociology, anthropology, and economics.

While physical science is a broad category, it is not a separate division from the other two main branches of science. Instead, it encompasses many sub-disciplines within the study of matter and energy.