Lesson Plan

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Lesson Plan
Grade: Date: 25/02/2026
Subject: Physics
Lesson Topic: recall and use the formula ∆EP = mg∆h for gravitational potential energy changes in a uniform gravitational field
Learning Objective/s:
  • Describe the concept of gravitational potential energy and its dependence on mass, gravity, and height.
  • Apply the formula ΔEP = m g Δh to calculate changes in potential energy for vertical motions.
  • Use energy conservation to relate changes in GPE to kinetic energy and determine speeds.
  • Identify common sign and unit errors and correct them in problem solving.
Materials Needed:
  • Projector or interactive whiteboard
  • Printed worksheet with practice questions
  • Calculator for each student
  • Set of masses and a metre ruler for a quick demo
  • Energy‑conservation demonstration video (optional)
 Introduction:
Begin with a quick demonstration: drop a ball from a known height and ask students to predict its speed at impact. Review prior knowledge of kinetic energy and the concept of work‑energy. State that by the end of the lesson they will be able to calculate gravitational potential energy changes using ΔEP = m g Δh and check their answers against energy‑conservation predictions.
Lesson Structure:
  1. Do‑now (5'): Students complete a short quiz on the KE formula and units.
  2. Mini‑lecture (10'): Derive and explain ΔEP = m g Δh, emphasise sign convention.
  3. Guided practice (12'): Work through the worked example, students fill steps on a worksheet.
  4. Hands‑on activity (10'): Small groups use masses and a ruler to measure Δh, calculate ΔEP, and compare with measured kinetic energy using a motion sensor.
  5. Concept check (8'): Quick exit poll (e.g., Kahoot) with common‑mistake questions.
  6. Summary & homework briefing (5'): Review checklist and assign practice questions.
Conclusion:
Recap the key steps for calculating gravitational potential energy and how they link to kinetic energy via conservation. Ask students to write one example on an exit ticket showing the sign they chose for Δh and why. For homework, complete the three practice problems provided in the worksheet.