Momentum in two dimensions

What this note covers

1. Conservation operates separately in perpendicular directions
2. Find an unknown outgoing momentum by subtraction
3. Construct and read scale-vector diagrams
4. Check kinetic energy after resolving the vectors
5. Distinguish momentum change from final momentum
6. Evaluate two-dimensional collision evidence
7. Worked oblique sticking collision: conserve each component
8. Worked three-fragment event: reconstruct a missing vector

8 sections · 10 key terms & formulas · 6 common mistakes