Phy – Chapter 3 + Chapter 4

SSC-I (9th) · Physics · Afaq Sun

Test your understanding of Dynamics with 22 syllabus-aligned MCQs designed for SSC-I (9th) Afaq Sun students.

Use this short practice session to revise key concepts, identify weak areas, and prepare for your board examination.

Sample Questions

See what you’ll practice in this quiz.

What is the SI unit of force?
Which of the following is a contact force?
Which fundamental force is responsible for the stability of atomic nuclei?

+19 more questions — Start Quiz

What You’ll Practice

Chapter 3: Dynamics Concept of Force: Definition of force, Effects of force, Contact forces, Non-contact forces, Unit newton | Fundamental Forces: Gravitational force, Electromagnetic force, Strong nuclear force, Weak nuclear force | Forces in a Free-Body Diagram: Free-body diagram, Weight, normal reaction, friction, tension, Net force | Newton's Laws of Motion: First law (inertia), Second law (F = ma), Third law (action and reaction), Examples | Limitations of Newton's Laws of Motion: High speed (relativity), Very small scale (quantum mechanics), Strong gravity, Inertial frames | Mass and Weight: Mass, Weight, W = mg, Variation of weight, Difference between mass and weight | Mechanical and Electronic Balances: Mechanical balances, Electronic balances | Friction: Kinetic friction, Rolling friction, Dissipative effect of friction, Terminal velocity, Methods to reduce friction | Momentum and Impulse: Momentum p = mv, Impulse, Impulse-momentum relation, Airbags and cushioning | Principle of Conservation of Momentum: Isolated system, Collisions, Recoil of a gun, Explosions and rockets
Chapter 4: Turning Effects of Forces Like and Unlike Parallel Forces: Like parallel forces, Unlike parallel forces, Resultant, Couple | Addition of Forces: Same-line forces, Head-to-tail method, Perpendicular forces, Resultant | Turning Effect of a Force: Moment of force (torque), Moment arm, Unit N m, Clockwise and anticlockwise moments | Resolution of Vectors: Components of a vector, Fx = F cos(theta), Fy = F sin(theta), Applications | Determination of a Force from its Perpendicular Components: Magnitude of resultant, Direction by tan inverse, Resolving and recombining forces | Principle of Moments: Clockwise equals anticlockwise moments, See-saw, Levers, Finding unknown forces | Centre of Gravity and Centre of Mass: Centre of gravity, Centre of mass, Centres of regular shapes, Finding centre of gravity of irregular lamina | Equilibrium: Static equilibrium, Dynamic equilibrium, Examples | Conditions of Equilibrium: First condition (net force zero), Second condition (net torque zero), Applications | States of Equilibrium: Stable equilibrium, Unstable equilibrium, Neutral equilibrium, Examples | Improvement of Stability: Lowering centre of gravity, Widening base, Line of action within base | Application of Stability in Real Life: Racing cars, Buses, Buildings and bridges, Human balance, Ships | Centripetal Force: Definition, Formula F = mv^2/r, Examples, Motion along a tangent

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SSC-I (9th) Physics Afaq Sun Series Chapter 3: Dynamics

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Phy – Chapter 3 + Chapter 4

Ch 1

Chapter 2: Kinematics

Chapter 3: Dynamics – I

Chapter 4: Dynamics – II

Ch 5

Chapter 6: Work and Energy

Chapter 7: Density and Temperature

Chapter 8: Magnetism

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