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🌈 Principle of Moments (ICSE Class 10)
For a balanced body, clockwise moments equal anticlockwise moments.
Clockwise Moment = Anticlockwise Moment
Body remains balanced and does not rotate.
Rotation in clock direction is negative.
Rotation opposite to clock direction is positive.
Beam balance, see-saw, weighing machine.
Greater force or greater distance produces larger moment.
🎯 Learning Objectives
- Understand principle of moments.
- Learn rotational equilibrium.
- Apply concept in daily life.
🧩 Competencies
- Conceptual Understanding
- Logical Thinking
- Numerical Skills
📊 Learning Outcomes
- Defines principle of moments correctly.
- Solves simple numerical problems.
- Identifies balanced conditions.
📌 Evidence
- Correct MCQ responses
- Numerical solving
- Class discussion participation
📝 MCQ Quiz
🧠 HOTS Questions
1. Why can a small child balance a heavy person on see-saw?
By sitting farther from pivot to increase moment.
2. Why is beam balance accurate?
Because clockwise and anticlockwise moments become equal.
3. Why does long handle help in opening tight nut?
Longer distance increases turning effect.
4. Can body rotate if moments are balanced?
No, balanced moments keep body in equilibrium.
5. Why are moments important in machines?
They help produce controlled rotational motion.
🔢 Simple Numericals
1. A force of 10 N acts at 2 m from pivot. Find moment.
Moment = Force × Distance
M = 10 × 2
Moment = 20 Nm
2. A 5 N force acts at 4 m distance. Find moment.
M = 5 × 4
Moment = 20 Nm
3. A beam is balanced by equal clockwise and anticlockwise moments of 30 Nm. State condition.
Clockwise Moment = Anticlockwise Moment
30 Nm = 30 Nm
Beam remains balanced.
