Gravitation Overview — AP Physics C: Mechanics
1. Unit at a Glance
This unit builds on your existing knowledge of forces, energy, and circular motion to explain gravitational phenomena that govern motion across the solar system. We start with the fundamental law of universal gravitation, then extend those core concepts to describe how planets and satellites move in stable orbits around larger bodies.
The two sub-topics below follow a sequential learning path: gravitational force and potential energy form the foundation you will use to analyze orbital motion, escape velocity, and orbital energy. We recommend completing them in the order listed below.
Common Pitfalls
Why: Gravitational force follows an inverse-square relationship, while potential energy follows an inverse relationship, which is easy to mix up.
Why: Many students confuse tangential speed with angular speed, leading to incorrect conclusions.