Class 9 Science Notes 2023 PDF Download.Physics is an important subject for those learners who want to pursue a career in engineering and other related fields. Most concepts are important in class 9 science because class 10 introduces many high level derivatives and concepts. Class 9 Science Notes 2023 PDF Download.

Therefore, it is important to understand all the concepts not only to get good marks in the exam but also to introduce them. In the vast field of knowledge. Therefore, to help students learn physics more effectively, physics notes on various topics for class 9 are provided in PDF format.

Check the chapters that are related to CBSE class 9 Science notes pdf and download from the links given below:

## Frequently asked Questions on CBSE Class 9 Science: Notes

### What is ‘matter’?

Matter is a substance that has inertia and occupies physical space

### What is ‘Gravity’?

Gravity is a natural phenomenon by which all things with mass or energy, including planets, stars, galaxies and even light, are attracted to one another.

### What is ‘Sound’?

The sensation perceived by the sense of hearing is known as Sound.

## Work:

The work done on a system by a constant force is the product of the component of the force in the direction of motion times the distance through which the force acts. For one-way motion in one dimension, this is expressed in equation form asW=Fdcosθ W=Fdcosθ

where WW is work, FF is the magnitude of the force on the system, dd is the magnitude of the displacement of the system, and θθ is the angle between the force vector FF d the displacement vector dd.

## Energy :

Energy is the capacity for doing work. It may exist in potential, kinetic, thermal, helectrical, chemical, nuclear, or other forms.

SI unit: joule

Dimension: M L2 T−2

Other units: kW⋅h, BTU, calorie, eV, erg, foot-pound