More schools in the United States have begun teaching physics to ninth-graders, but there continues to be limited evidence that such a change benefits students. Many arguments in favor of Physics First and the inverted sequence of physics-chemistry-biology are based more on the intellectual logic of the sequence than on measured outcomes. Paul…

The idea of teaching physics to ninth-graders, known as "Physics First," has become more and more popular among physics educators in this country. However, introducing ninth-grade physics has been an uphill battle; such a change has a major impact on the students, parents, teachers, and the school administration. Switching to Physics First affects…

For more than a hundred years there has been a debate about the sequence in which high school science should be taught. Many advocates of "Physics First" support a more conceptual ninth-grade physics course followed by chemistry and then biology while supporters of mathematically rigorous physics favor a sequence of biology-chemistry-physics. This…