# 9th Class Physics Notes [Updated Edition] If you are in search of 9th Class Notes for Physics to prepare for your annual exams or for a test, than you are at the right place.

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# Chapter
1 Physical Quantities and measurement
2 Kinematics
3 Dynamics
4 Turning Effect of Forces
5 Gravitational
6 Work and Energy
7 Properties of Matter
8 Thermal properties of Matter
9 Transfer of Heat

## Chapter 1: Physical Quantities and measurement After Studying this unit, you will be able to describe the crucial role of Physics in Science, Society and Technology and also explained that Science is based on physical quantities which consist of numerical magnitude and a unit. You will be able to write the answer in scientific notation in measurement and calculations.

## Chapter 2: Kinematics After studying this unit you will be able to describe how objects can be at rest or in motion simultaneously, identify different types of motion translatory, vibratory and rotatory, linear and circular motion and also distinguishes among them. And you will be able to define the following terms with examples:

##### Major concepts:
• Distance and displacement
• Speed and velocity
• Scaler and vector
• Linear and circular motion
• Vibratory and rotatory motion

## Chapter 3: Dynamics After studying this unit you will be able to define momentum force inertia, friction and centripetal force and also able to explain newtons law of motion, distinguishes between mass and weight and solve problems using f=ma and w=mg. You will be able to explain the law of conservation of momentum and also able to explain conservation of momentum in the collision of two objects.

##### Major concepts:
• Momentum
• Newtons law of motion
• Friction
• Uniform circular motion

## Chapter 4: Turning Effect of Forces After studying this unit you will be able to define like and unlike parallel forces, state head to tail rule of vector addition of forces and vectors, describe how a force is resolved into its perpendicular components, determine the magnitude and direction of a force from it's perpendicular components, define moment of force or torque as moment=force*perpendicular distance from pivot to line of action of force and define centre of mass and centre of gravity of body.

##### Major concepts:
• Force on bodies
• Resolution of forces
• Moment of a force
• Principle of moments
• Centre of mass
• Couple
• Equilibrium
• Stability

## Chapter 5: Gravitational After studying this unit you will be able to state newtons law of gravittation, explain that gravitational forces or consistant with newtons third law of motion, explain gravitational field as an example of the field of force, define the weight and also capable to calculate the mass of the earth by using the law of gravitation. You will be able to solve problems using newtons law of gravitation and discuss the importance of newtons law of gravitation in understanding the motion of satelites.

##### Major concepts:
• Law of gravitation
• Measurement of the mass of earth
• variation of g with altitude
• Motion of artificial satellites

## Chapter 6: Work and Energy After studying this unit you will be able to define work and its System International Units, calculate work done using the equation: work=force*distance moved in the direction of the force. You will be able to define energy, kinetic energy, potential energy and unit of energy.

##### Major concept:
• Work
• Energy
• Kinetic energy
• Potential energy
• Forms of energy
• Interconversion of energy
• Major sources of energy
• Efficiency
• Power

## Chapter 7: Properties of Matter You will learn to state kinetic molecular model of matter, describe briefly the fourth state of matter i.e. Plasma, define the term density, compare the densities of a few solids, liquids and gases. You will also learn to explain that the atmosphere exerts a pressure, describe how the height of a liquid column may be used to measure the atmospheric pressure, describe that atmospheric pressure decreases with the increase in height above the Earth's surface.

##### Major concepts:
• Kinetic molecular model of matter
• Density
• Pressure
• Atmospheric pressure
• Pressure in liquids
• Upthrust
• Principle of floatation
• Elasticity
• Stress, strain and Young's modulus

## Chapter 8: Thermal properties of Matter After studying this chapter you will be able to define temperature (as a quantity which determines the direction of flow of thermal energy). You will also be able to list basic thermometric properties for a material to construct a thermometer, convert the temperature from on scale to another(Fahrenheit, Celsius and Kelvin scales), describe the rise in temperature of a body in terms of an increase in its internal energy.

##### Major concepts:
• Temperature and heat
• Thermometer
• Specific heat capacity
• Latent heat of fusion
• Latent heat of vaporization
• Evaporation
• Thermal expansion

## Chapter 9: Transfer of Heat After studying this unit you will be able to recall that thermal energy is transferred from a region of higher temperature to a region of lower temperature, describe the terms of molecules and electrons, state the factors affecting the transfer of heat through solid conductors and hence, define the term thermal conductivity. You will also be able to write examples of good and bad conductors of heat and describe their uses, explain the convection currents in fluids due to difference in density.

##### Major concepts:
• The three process of heat transfer
• Conduction
• Convection