Here we are providing 9th class Physics notes. These 9th class Physics notes will provide a complete and accurate explanations as well as answers for each chapter and topic. Important long questions, solved exercises, important short questions and answers and board multiple choice questions are added in these notes. Students can access these notes given here for free and these are the premier study materials that will prove to be useful in preparing exams and scoring higher marks in the exams.

## 9th Class Physics Notes

Physics extends well into our everyday life, describing the motion, forces and energy of ordinary experience. In actions such as walking, driving a car or using a phone, physics is at work. For everyday living, all the technologies you might take for granted exploit the rules of physics.

9th class Physics notes are written according to the papers pattern of Federal Board, Sargodha Board, Lahore Board, Faisalabad Board, Sahiwal Board, Multan Board, DG Khan, Azad Kashmir Board, Rawalpindi Board and all other boards of Punjab.

9th Class Physics book consists of nine chapters. These are:

Here we have uploaded 9th class Physics complete notes.

### What is Physics?

In the nineteenth century, physical sciences were divided into five distinct disciplines; Physics, Chemistry, Astronomy, Geology and Meteorology. The most fundamental of these if the Physics. In Physics, we study matter, energy and their interaction. The laws and priciples of Physics help us to understand nature.9th Class Physics book consists of nine chapters. These are:

- Physical Properties and Measurements
- Kinematics
- Dynamics
- Turning Effects of Forces
- Work and Energy
- Properties of Matter
- Thermal Properties of Matter
- Transfer of Heat

Here we have uploaded 9th class Physics complete notes.

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- Physical Quantities and Measurements
- Topics: Introduction to Physics – Physical Quantities – International System of Units – Prefixes – Scientific Notation – Measuring Instruments – Significant Figures

**Summary**

**Physical Quantities:**All measurable quantities are called physical quantities such as length, mass, time and temperature. Physical quantities are divided into base quantities and derived quantities.

**International System of Unit:**The eleventh General Conference on Weight and Measures held in Paris in 1960 adopted a world-wide system of measurements called International System of Units.

**Prefixes:**Prefixes are the words or letters added before SI units such as kilo, mega, giga and milli.

**Scientific Notation:**In scientific notation a number is expressed as some power of ten multiplied by a number between 1 and 10.

**Measuring Instruments:**Measuring instruments are used to measure various physical quantities such as length, mass, time, volume, etc.

**Significant Figures:**All the accurately known digits and the first doubtful digit in an expression are called significant figures.

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- Kinematics
- Topics: Rest and Motion – Types of Motion – Scalars and Vectors – Displacement – Speed – Velocity – Acceleration – Graphical Analysis of Motion – Equations of Motion – Gravitational Acceleration.

Summary

A body is said to be in motion, if it changes its position with respect to its surroundings.

vf = vi + at

S = vit + 1/2at^2

2aS = vf^2 - vi^2

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**Rest and Motion:**A body is said to be at rest, if it does not change its position with respect to its surroundings. similarly,A body is said to be in motion, if it changes its position with respect to its surroundings.

**Types of Motion:**There are three types of motion.- Translatory motion
- Rotatory motion
- Vibratory motion

**Scalars:**A scalar quantity is described completely by its magnitude only.**Vectors:**A vector quantity is described completely by magnitude and direction.**Displacement:**Displacement is the shortest distance between two points which has magnitude and direction.**Speed:**The distance covered by an object in unit time is called its speed.**Velocity:**The rate of displacement of a body is called its velocity.**Acceleration:**Acceleration is defined as the rate of change of velocity of a body.**Graphical Analysis of Motion:**Graph is a pictorial way of describing information as to how various quantities are related to each other.**Equations of Motion:**Equations of motion for uniformly accelerated motion are:vf = vi + at

S = vit + 1/2at^2

2aS = vf^2 - vi^2

**Gravitational Acceleration:**When a body is dropped freely it falls down with an acceleration towards Earth. This acceleration is called acceleration due to gravity and is denoted by g.Urdu medium students can download Urdu medium Physics notes. Download buttons are given below. Click them to preview online or direct download.

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- Dynamics
- Topics: Force – Inertia – Momentum – Newton’s Laws of Motion – Friction – Uniform Circular Motion.

**Summary**

**Force:**A force is a push or pull. It moves or tends to move, stops or tends to stop the motion of a body.

**Inertia:**Inertia of a body is its property due to which it resists any change in its state of rest or uniform motion in a straight line.

**Momentum:**Momentum of a body is the quantity of motion possessed by the body. Momentum of a body is equal to the product of its mass and velocity

**Newton's first law of motion:**Newton's first law of motion states that a body continues its state of rest or of uniform motion in a straight line provided no net force acts on it.

**Newton's 2nd law of motion:**Newton's second law of motion states that when a net force acts on a

body, it produces acceleration in the body in the direction of the net force. The magnitude of this acceleration is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically, F = ma.

**Mass:**Mass of a body is the quantity of matter possessed by it. It is a scalar quantity. SI unit of mass is kilogramme (kg).

**Weight:**Weight of a body is the force of gravity acting on it. It is a vector quantity. SI unit of weight is newton (N).

**Newton's third law of motion:**Newton's third law of motion states that to every action there is always an equal and opposite reaction.

**Law of conservation of momentum:**Law of conservation of momentum states that the momentum of an isolated system of two or more than two interacting bodies remains constant.

**Friction:**The force that opposes the motion of a body is called friction..

**Rolling friction:**Rolling friction is the force of friction between a rolling body and a surface over which it rolls. Rolling friction is lesser than the sliding friction.

**Circular Motion:**The motion of a body moving along a circular path is called circular motion.

**Centripetal Force:**The force which keeps the body to move in a circular path is called the centripetal force.

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- Turning Effects of Forces
- Topics: Like and Unlike Parallel forces – Addition of Forces – Resolution of Forces – Torque of Moment of a Force – Principle of Moments – Center of Mass – Couple – Equilibrium – Stability and Position of Center of Mass.

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- Gravitation
- Topics: The Force of Gravitation – Mass of Earth – Variation of “g” with Altitude – Artificial Satellites.

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- Work and Energy
- Topics: Work – Energy – Kinetic Energy – Potential Energy – Forms of Energy – Interconversion of Energy – Major Sources of Energy – Efficiency - Power.

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- Properties of Matter
- Topics: Kinetic Molecular Model of Matter- Density – Pressure – Atmospheric Pressure – Pressure in Liquids – Archimedes Principle – Principle of Flotation – Elasticity – Hook’s Law

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- Thermal Properties of Matter
- Topics: Temperature and Heat – Thermometer – Specific Heat Capacity – Change of State – Latent Heat of Fusion – Latent Heat of Vaporization – The Evaporation – Thermal Expansion.

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- Transfer of Heat
- Topics: Transfer of Heat - Conduction - Convection - Radiation - Application and Consequences of Radiation

To download Important numerical problems for Urdu medium Students, click the following link

Numericals

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