Ch-07: Properties of Matter

Ch-07: Properties of Matter 

After studying this unit, the students will be able to:

• State kinetic molecular model of matter (solid, liquid and gas forms).
• Describe briefly the fourth state of matter, i.e plasma.
• Define the term density.
• Compare the densities of a few solids, liquids and gases.
• Define the term pressure (as a force acting normally on unit area).
• Explain how pressure varies with force and area in the context of everyday examples.
• 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.
• Explain that changes in atmospheric pressure in a region may indicate a change in the weather.
• State Pascal's law.
• Apply and demonstrate the use with examples of Pascal\'s law.

Ch-06: Work & Energy

Ch-06: Work & Energy 

After studying this unit, the students will be able to:

• Define work and its SI unit.
• Calculate word done using equation: Work = force x distance moved in the direction of force
• Define energy, kinetic energy and potential energy. State unit of energy.
• List the different forms of energy with examples.
• Describe the processes by which energy is converted from one form to another.
• State mass energy equation E-mc2 and solve problems using it.
• Describe the process of electricity generation by drawing a block diagram of the process from fossil fuel input to electricity output.
• List the environmental issues associated with power generation.

Ch-05: Gravitation

Ch-05: Gravitation

After studying this unit, the students will be able to:

• State Newton's law of gravitation.
• Explain that the gravitational forces are consistent with Newton's third law.
• Explain gravitational field as an example of field of force.
• Define weight (as the force on an object due to gravitational field).
• Calculate the mass of Earth by using law of gravitation.
• Solve problems using Newton's of gravitation.

Ch-04: Turning Effects of Force

Ch-04: Turning Effects of Force 

After studying this unit, the students will be able to:

• Define like and unlike parallel forces.
• State head to tail rule of vector addition of forces / vectors.
• Describe how a force is resoved into its perpendicular components.
• Determine the magintude and direction of a force from its perpendicular components.
• Define moment of force or torque as moment = force x perpendicular distance from pivot to the line of action of force.
• Explain the turning effect of force by relating it to everyday life. - State the principle of moments.
• Define the centre of mass and centre of gravity of a body.
• Define couple as a pair of forces tending to produce rotation.
• Prove that the couple has the same moments about all points.

Ch-03: Dynamics

Ch-03: Dynamics

After studying this unit, the students will be able to:

• Define momentum, force, inertia, friction and centripetal force.
• Solve problems using the equation Force = change in momentum / change in time.
• Explain the concept of force by practical examples of daily life.
• State Newton's laws of motion.
• Distinguish between mass and weight and solve problems using F=ma, and w=mg.
• Calculate tension and acceleration in a string during motion of bodies connected by the string and passing over frictionless pulley using second law of motion.
• State the law of conversation of momentum.
• Use the principle of conservation of momentum in the collision of two objects.

Ch-02: Kinematics

Ch-02: Kinematics

After studying this unit, the students will be able to:

• Describe using examples how objects can be at rest and in motion simultaneously.
• Identify different types of motion i.e translatory (linear random and circular); rotatory and vibratory motions and distinguish among them.
• Differentiate with examples between distance and displacement, speed and velocity.
• Differentiate with examples between scalar and vector quantities.
• Represent vector quantities by drawing.
• Define the terms speed, velocity and acceleration.
• Plot and interpret distance-time graph and speed-time graph.
• Determine and interpret the slope of distance-time and speed-time graph.

Ch-01: Physical Quantities and Measurements

Ch-01: Physical Quantities and Measurements

After studying this unit, the students will be able to:

• Describe the crucial role of Physics in Science, Technology and society.
• Explain with examples the Science is based on physical quantities which consist of numerical magnitude and a unit.
• Differentiate between base and derived physical quantities.
• List the seven units of System International (SI) alongwith their symbols and physical quantities (standard definitions of SI units are not required).
• Interconvert the prefixes and their symbols to indicate multiple and sub-multiples for both base and derived units.

Physics Symbols

What is the Importance of Physics Symbols?

In Physics, different symbols or documentations are utilized to mean various amounts. The indications make the portrayal of the amounts simpler. In this page, probably the most well known physics symbols are referenced. Let us assume that a lady drives her car at a speed of 30 kmph and reaches her hometown in 2 hrs and if she drives at 50 kmph, she reaches in 1.5 hr. So, if we have to represent these units as symbols, how can we do that?

Symbols used for physical quantities are vastly different. Sometimes, the symbol may be the first letter of the physical quantities they represent, like ‘d’, which stands for distance. Other times, they may be completely unrelated to the name of the physical quantities, such as c symbolises the speed of light.

Ch-12: Geometrical Optics

Chapter-12: Geometrical Optics 

Here this post contains Short Question and Answers of Chapter 12: "Geometrical Optics". Learn these question answers and other related stuff for exam preparation. 

Geometrical optics is a branch of optics where light is described by rays. Light rays are conceived as geometrical lines originating from sources, extending through media, and being revealed by detectors; their directions account for paths along which light flows.

Ch-11: Sound

Ch-11: Sound 

Here this post contains Short Question and Answers of Chapter 11: "Sound". Learn these question answers and other related stuff for exam preparation. 

A sound is a type of energy, very much like power, intensity or light. Sound is one of the significant feelings of the human body. A few sounds are wonderful, and some are irritating. We are exposed to different kinds of sound all time. Sound is a vibration that spreads as an acoustic wave, through a transmission medium

Ch-10: Simple Harmonic Motion and Waves

Ch-10: Simple Harmonic Motion and Waves

Here this post contains Short Question and Answers of Chapter 10 - Physics "Simple Harmonic Motion and Waves". Learn these question answers and other related stuff for exam preparation.

Simple Harmonic Motion or SHM can be defined as a motion in which the restoring force is directly proportional to the displacement of the body from its mean position. Understand SHM along with its types, equations and more.

Physics formulas

(a + b)2= a2 + 2ab + b2

(a – b)2 = a2 – 2ab + b2

a2 – b2 = (a + b)(a – b)

Ch-08: Thermal Properties of Matter

Ch-08 – Thermal Properties of Matter

Here this post contains Short Question and Answers of Chapter 08. 5th Chapter of Physics is "Thermal Properties of Matter". Learn these question answers and other related stuff for exam preparation.

1. Why does flow from hot body to cold body?

Answer : Heat flow from hot body to cold body to attain the condition of thermal equilibrium.

Ch-07: Properties of Matter

Ch-07: Properties of Matter

This is a simple post about Physics Notes of 9 Class. This post Contains 9th Class Physics Chapter 7 Notes – Short Questions and Numerical for the students. You can add these short questions to the list of your preparation for exams.

Q.1: Write some important features of the kinetic molecular model of matter.

Ans.

1. The matter is made up of particles called molecules
2. The molecules remain in continuous motion

Ch-06: Work and Energy

Ch-06: Work and Energy

This post contains Physics Chapter 6 Notes Class 9 and Short Questions for the students. Name of this Chapter is "Work and Energy". Here you will find some solved Short Questions with Answers. Learn these question answers and related stuff for exam preparation.

Q.1: Why fossil fuels are called the non-renewable form of energy?

Ans. The fossils fuels are one used to get energy and consumed completely. So there are not renewable.

Q.2: A stone of mass 500g strikes the ground with a velocity of 20 mS-¹.

Ch-05: Gravitation

Ch-05 – Gravitation

Here this post contains Short Question and Answers of Chapter 05. 5th Chapter of Physics is "Gravitation". Learn these question answers and other related stuff for exam preparation.

Q.1 What is meant by gravitational field strength?

Ans. In the gravitational field of the Earth, the gravitational force per unit mass is called the gravitational field strength of the earth.

Ch-04: Turning Effect of Forces

Chapter-04: Turning Effect of Forces

This post contains Notes of Physics for Class 9 for students of 9th grade. Here, you will find the 9th Class Physics Chapter 4 Notes, Numerical and Short questions with Answers. This chapter’s name is Turning effect of Forces. These Questions are for practice. However, students should prepare more study material besides these notes.

Q.1: Define: (i) Resultant Vector. (ii) Centre of gravity.

Ans:
(i) Resultant vector: The vector whose effect is the same as the combined affect of a number of vectors is called the resultant vector.

Ch-03: Dynamics

Ch-03: Dynamics
The third chapter of 9th Class Physics is "Dynamics". Short Questions with Answers of Chapter 03 of Physics Class 9. Here in this post you will find short questions and answers of chapter 3. Learn these short questions for exams preparation.
Q.1: Write two methods to reduce friction.
Ans. Friction can be reduced by: Making sliding surface moth. Lubricating the sliding surface.
Q.2: A force of 20N moves a body with an acceleration of 2mS-1. What is its mass?
Ans: F = 20N

Ch-02: Kinematics

Ch-02: Kinematics
This post contains the Physics Chapter 2 Short Qs for Class 9. Name of the 2nd chapter is Kinematics and all the short Qs are solved. Students of 9th Class can prepare these short Qs for the exams. However, they should prepare other Qs as per the instructions of their teachers too.
Q.1: A car travelling at 10 mS-1 accelerates uniformly at 2mS-2. Calculate its velocity after 5 seconds.
Solution. Vi = 10 mS-1 a = 2 ms-2 t = 5s Vf = ? Using the equation: Vf = Vi + at Vf = Vi + at Vf = 10 mS-1 + 2 ms-2 x 5s

Ch-01: Physical Quantities and Measurement

Ch-01: Physical Quantities and Measurement
Short Questions with Answers of Chapter 01 of Physics Class 9. The first chapter of 9th Class Physics is “Physical Quantities and Measurement”. Here in this post you will find short questions with answers. Learn these short questions for exams preparation.
1: Why Is the use of zero error necessary in a measuring instrument?
Ans. By the use at "Zero Error" the observation taken can be corrected, to get a correct observation