Lesson Plan

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Lesson Plan
Grade: Date: 18/01/2026
Subject: Physics
Lesson Topic: Describe, and use the concept of, weight as the effect of a gravitational field on a mass
Learning Objective/s:
  • Describe the relationship between mass, weight and gravitational field strength (W = mg).
  • Explain how weight varies with different gravitational environments while mass remains constant.
  • Distinguish between mass and weight, including their scalar/vector nature and units.
  • Use a spring‑scale concept to measure weight and convert it to mass.
  • Identify and correct common misconceptions about weight and mass.
Materials Needed:
  • Projector and screen for slides/diagrams
  • Whiteboard and markers
  • Spring scales or digital force meters for demonstration
  • Worksheet with weight‑calculation problems
  • Calculators for each student
  • Images or models of Earth and Moon gravitational fields
 Introduction:

Begin with a quick demonstration of a spring scale showing the same object on Earth and a video of an astronaut in orbit, prompting students to consider why the readings differ. Review prior knowledge of mass as a measure of matter and the concept of force. State that by the end of the lesson students will be able to calculate weight in any gravitational field and explain the distinction between mass and weight.
Lesson Structure:
  1. Do‑now (5') – Short quiz on mass vs. weight on the worksheet.
  2. Mini‑lecture (10') – Define mass, weight, gravitational field strength; introduce W = mg with examples.
  3. Demonstration (8') – Use spring scales to compare the weight of a 1 kg mass on Earth and calculate its lunar weight.
  4. Guided practice (12') – Pairs solve problems calculating weight on Earth, Moon, and an unknown planet; teacher circulates.
  5. Concept check (5') – Quick poll/exit ticket: students write one key difference between mass and weight.
  6. Misconception discussion (5') – Address common misconceptions using click‑through questions.
Conclusion:

Summarise that weight is the gravitational force on a mass and changes with g, while mass stays constant. Ask students to share one example of how weight would differ on another planet as a retrieval check. Assign homework: complete additional weight‑calculation problems and bring a question about real‑world applications.