5.4 — Collisions
Collisions are momentum transfers — the “before” and “after” must balance for an isolated system.
🖼️ One-Page Visual Summary (Infographic)
🧭 Plot Summary
A collision is an interaction where objects exchange momentum over a short time. The key idea is that while forces inside the system can be large, they come in action–reaction pairs — so the system’s total momentum can remain the same.
In this lesson, you’ll compare different collision outcomes, bounce vs. stick, and focus on what you can determine conceptually: direction, relative speeds, and which object experiences the biggest change in motion.
Why it matters:
Collisions are everywhere — sports, vehicles, physics labs, and space travel. Understanding collision momentum lets you predict outcomes even when forces are hard to measure directly.
Inside: detailed explanations, graphical relationships, mathematical reasoning, and guided practice.
✅ Self-Check
- ◻ I can describe a collision as momentum transfer within a system.
- ◻ I can explain why total momentum can stay constant in an isolated system.
- ◻ I can compare “stick together” vs. “bounce apart” outcomes conceptually.
- ◻ I can predict which object undergoes a larger change in motion in a collision.