AP Physics C Mechanics: Energy & Momentum
Work, energy, and momentum on AP Physics C Mechanics often appear in multi-part FRQs — choose energy when forces are non-constant or path matters; choose momentum for collisions and explosions.
Hub: AP Physics C Mechanics · FRQs · Rotation.
When to use which law
| Situation | Tool |
|---|---|
| Springs, height, speed | Energy conservation |
| Variable force along path | W = ∫F·dx |
| Two bodies collide | Momentum conservation |
| Explosion / recoil | Momentum + energy if asked |
Calculus reminders
- Power: P = F·v (dot product).
- Centre of mass: ∫x dm / M in advanced setups.
- Non-conservative work — include friction loss explicitly.
Frequently asked questions
Elastic vs inelastic?
Check if problem asks for kinetic energy before/after.
Rotation + momentum?
Angular momentum — rotation revision.
Practice tests?
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