Phy – Quarter 2

SSC-I (9th) · Physics · Afaq Sun

Test your understanding of Turning Effects of Forces 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.

Two forces are acting on a body in the same direction. Such forces are called:
The perpendicular distance from the pivot to the line of action of a force is called:
A couple consists of two forces which are:

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What You’ll Practice

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
Chapter 5: Work, Energy and Power Work: Definition of work, W = Fd cos(theta), Unit joule, Positive, negative and zero work, Work from graph | Energy: Kinetic energy, Potential energy, Other forms of energy, Work-energy relation | Conservation of Energy: Law of conservation of energy, Energy transformations, Pendulum and falling body, Energy losses | Sources of Energy: Fossil fuel energy, Hydroelectric, Solar, Geothermal, Wind, Nuclear, Tidal and wave, Biofuel | Impact of Various Energy Sources: Economic impact, Social impact, Environmental impact, Fossil fuels, nuclear, hydro, solar and wind compared | Advantages and Disadvantages of Energy Sources: Hydroelectric, Solar, Wind, Fossil fuels, Nuclear, Geothermal, Biofuel | Power: Definition, P = W/t, Unit watt, Horsepower, P = Fv | Efficiency: Efficiency formula, Wasted energy, Why 100% efficiency is impossible, Improving efficiency

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SSC-I (9th) Physics Afaq Sun Series Chapter 4: Turning Effects of Forces

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Phy – Quarter 2

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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