9th Class Physics Chapter 4 Turning Effects of Forces Notes PDF (Urdu Medium)

Master the principles of rotation and equilibrium with our 9th Class Physics Chapter 4 notes. Learn how forces turn objects and how stability is achieved.

Torque or Moment of a Force

Principle of Moments

Center of Mass and Center of Gravity

Couple

Equilibrium and its Conditions

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Important Questions

• Define Torque and state its SI unit.
• What is meant by the Center of Gravity?
• Differentiate between stable, unstable, and neutral equilibrium.

Topics / Numericals

• Numerical 4.2: Find perpendicular components of a force
• Numerical 4.4: Calculating torque for a nut
• Numerical 4.6: Steering wheel couple moment calculation

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Chapter 4