| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: apply the principle of conservation of momentum to solve simple problems, including elastic and inelastic interactions between objects in both one and two dimensions (knowledge of the concept of coefficient of restitution is not required) |
Learning Objective/s:
- Describe momentum and impulse as vector quantities.
- Apply conservation of momentum to solve one‑dimensional elastic and perfectly inelastic collisions.
- Extend momentum analysis to two‑dimensional collisions using component equations.
- Solve collision problems by selecting appropriate equations and checking results for physical plausibility.
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Materials Needed:
- Projector or interactive whiteboard
- Slide deck with formulas and example diagrams
- Worksheet with practice collision problems
- Low‑friction carts and track for demonstration
- Motion‑sensor/video‑analysis app (optional)
- Calculator for each student
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Introduction:
Begin with a short video of billiard balls colliding to spark curiosity. Review that momentum is a vector and recall the impulse‑momentum relationship from the previous lesson. State that today students will demonstrate they can use momentum conservation to predict outcomes of both elastic and inelastic collisions in one and two dimensions.
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Lesson Structure:
- Do‑now (5') – Quick quiz on definitions of momentum and impulse.
- Mini‑lecture (10') – Reinforce vector nature of momentum, conservation law, and distinction between elastic and inelastic collisions.
- Guided 1‑D elastic example (10') – Walk through the worked example, highlighting diagram, equations, and unit check.
- Hands‑on demo (15') – Use carts on a track to perform elastic and perfectly inelastic collisions; students record speeds and calculate final velocities.
- 2‑D problem solving (15') – Small groups solve the two‑dimensional inelastic collision example, present vector decomposition and final speed/direction.
- Check for understanding (5') – Exit ticket: solve a novel momentum‑conservation problem individually.
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Conclusion:
Recap the key steps: diagram, list knowns, write component momentum equations, and verify results. Collect exit tickets to gauge individual mastery and address any lingering misconceptions. Assign homework: a set of mixed 1‑D and 2‑D collision problems to reinforce today’s procedures.
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