Dynamics Overview — AP Physics 1
1. Unit at a Glance
We build this unit from the ground up, starting with the fundamentals of each of Newton's three laws. We begin with the concept of inertia (First Law), move to the core relationship between net force, mass, and acceleration (Second Law), then cover action-reaction pairs (Third Law). Along the way you will master free-body diagrams, the most important tool for solving any force problem.
After covering core laws and individual common forces (gravity, weight, friction, tension), we apply these concepts to common exam problem scenarios, including inclined planes, Atwood machines, and multi-object system models. This sequence progresses from foundational concepts to applied problem solving, aligned directly with how the AP Physics 1 exam tests these topics.
Common Pitfalls
Why: Action-reaction pairs always act on two different objects, so they never cancel out on a single object
Why: Net force calculations require all forces to align with your chosen coordinate system
Why: Tension only equals weight for systems in equilibrium (acceleration = 0)