Class 9 Physics | Chapter 4 | Numerical 4.5 | Principle of Moments | Crowbar Problem

Class 9 Physics | Chapter 4 | Numerical 4.5 | Principle of Moments | Crowbar Problem
In this lecture, we solve Numerical 4.5 from Chapter 4: Turning Effect of Forces of Class 9 Physics according to the Punjab Textbook Board (New Syllabus).
This numerical is based on the Principle of Moments and its application in a real-life tool called a crowbar. A crowbar works as a lever, where a small force applied at a larger distance can lift a heavy load.
We use the concept:
👉 Clockwise Moment = Anticlockwise Moment
👉 F₁ × d₁ = F₂ × d₂
Where:
F = force applied
d = perpendicular distance from pivot
In this problem, a force is applied at one end of the crowbar, and we calculate the weight lifted at the other end using the principle of moments.
🔎 What You Will Learn in This Video
Concept of lever and crowbar
Principle of moments in real life
How distance affects turning effect
Mechanical advantage of a lever
Step-by-step numerical solving method
Writing final answer with correct SI units
Common mistakes in lever problems
📚 Concepts Covered
✔ Principle of moments
✔ Torque (moment of force)
✔ Lever system
✔ Mechanical advantage
✔ Pivot and distance
✔ Clockwise and anticlockwise moments
✔ Board exam solving technique
🎯 Why Numerical 4.5 Is Important
Very important for board exams
Frequently asked in numericals and MCQs
Real-life application of physics concepts
Helps understand simple machines (levers)
Easy and scoring numerical if concept is clear
👉 Watch the full Chapter 4 Turning Effect of Forces playlist for complete preparation.
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Видео Class 9 Physics | Chapter 4 | Numerical 4.5 | Principle of Moments | Crowbar Problem канала Sir Bilal Saleem