| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: Define the moment of a force as moment = force × perpendicular distance from the pivot; recall and use this equation |
Learning Objective/s:
- Define the moment (torque) of a force and state its formula.
- Explain how perpendicular distance and direction affect the sign and magnitude of a moment.
- Apply M = F × d⊥ to calculate torque in simple scenarios.
- Analyse rotational equilibrium using the principle of moments.
- Identify and correct common errors when calculating moments.
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Materials Needed:
- Projector and screen
- Whiteboard and markers
- Ruler or measuring tape
- Spring‑scale force meters
- Worksheet with practice questions
- Diagram handout of a lever
- Calculators
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Introduction:
Begin with a quick demonstration of opening a door using the handle at different distances to illustrate the turning effect of a force. Recall that both the magnitude of the force and its perpendicular distance from the pivot determine how easily an object rotates. Today we will define the moment of a force, derive its equation, and practise applying it to solve torque problems. Success will be shown by correctly calculating moments in the worksheet.
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Lesson Structure:
- Do‑now (5') – Students answer: “What factors make a door easier or harder to open?” Share responses.
- Concept introduction (10') – Teacher presents definition, formula M = F × d⊥, units and direction using projector and lever diagram.
- Guided example (10') – Work through the 30 N × 0.25 m wrench problem, checking each step.
- Hands‑on activity (15') – Small groups use spring scales and rulers on a lever to measure forces and perpendicular distances, then calculate moments.
- Principle of moments (10') – Explain rotational equilibrium; groups test with two forces on a seesaw diagram.
- Independent practice (15') – Students complete worksheet questions while teacher circulates.
- Check for understanding (5') – Exit‑ticket: one torque problem to solve individually.
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Conclusion:
We reviewed how to calculate the moment of a force and why perpendicular distance and direction matter. The exit‑ticket demonstrated that students can apply the formula accurately. For homework, complete the additional set of torque problems on the worksheet and bring any questions to the next lesson.
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