Presently, physics is one of the core science subjects for Indian students in class 9 and they can use many textbooks in their studies. Still, in terms of prominence, not many books can match Science for Ninth Class Physics (authors: Lakhmir Singh and Manjit Kumar) published by S Chand. The book covers all the topics set out by Central Board of Secondary Education and National Council of Educational Research and Training. If you want to learn more S Chand Physics Class 9, my article can help you out.
Elements Of The Book
- Drawings and images: In times of need, the book includes drawings, graphs, and images to explain matters in context. For optimal comprehension, S Chand Physics Class 9 prioritizes real, colored images (for instance, the scene of people participating in tug-of-war is used to demonstrate unbalanced forces).
- Sample problems: In every topic, Lakhmir prepared exam-like questions alongside their solutions and called them sample problems. Arranged in steps, such solutions should come in handy as students tackle similar questions.
- Questions: At the end of every chapter and towards the end of the book, students will come across all sorts of question types. The questions allow students to gauge their understanding and get used to what awaits them in examination rooms.
S Chand Physics Class 9: Outlines
For your information, the book consists of five chapters divided into two parts: the first term contains the first three chapters and the remaining two belong to the second term.
First Term
Motion
Objects can change their positions over time and in physics, such a phenomenon is called motion. The first chapter starts by laying out the concept of motion and rest and how students can measure motion. Key subtopics in the chapter comprise distance traveled and displacement, types of motion (uniform and non-uniform), speed, velocity and acceleration. After they finish the chapter, students must know how to derive various equations of uniformly accelerated motion and represent motion in graphs using distance-time graphs as well as speed-time graphs.
Force And Laws Of Motion
Every day, via force, people apply physics as they shut the door, kick a ball, tighten the cap of a water bottle, etc. The second chapter of the book states that students cannot see force but they can judge it by the effects it causes. Throughout the chapter, students will learn about types of forces (balanced and unbalanced) in addition to Newton’s laws of motion from first to third. Once students master the chapter, they should also be able to describe the term conservation of energy, its mathematical calculation and real-world applications.
Gravitation
Whenever people throw an object from heights, it falls towards the earth owing to a force called gravity. The third chapter concentrates on gravity as well as related mathematical equations, calculations, …. Students will get to learn about principles like the universal law of gravitation by Isaac Newton and Kepler’s laws of motion by John Kepler. Additionally, students can delve deep into equations of motions for free-falling bodies, differences between mass and weight, thrust and pressure, pressure in fluids and buoyancy. The chapter as well as the first terms comes to an end by taking a look at Archimedes’ principle and why objects float/sink in a liquid.
Second Term
Work And Energy
In physics, work is done when a force causes motion (here is an example: when you climb stairs, work is done by moving your body against gravity). To gain a comprehensive understanding of work, students must read through the subtopics consisting of units of work and work done by a force acting obliquely.
On the other hand, energy is the ability to do work and it’s discussed in the section of units and forms of energy. Lakhmir also took the opportunity to talk about power, the rate of doing work, commercial units of energy and transformation of energy.
Sound
As vibrations that can travel through various mediums—gas, liquid, and solid, sounds in essence enable us to hear. In the last chapter of S Chand Physics Class 9, the author explained about the longitudinal of sound waves’ particles that move back and forth. The chapter is broken down into characteristics of a sound wave, production of sound, speed of sound, reflection of sound and the human ear.
Tips And tricks
Quite a few students think of physics as a complex subject as a result of the formulas and calculations in it. Still, if you know the way to study, physics is going to be one the easiest subjects in the curriculum. Before moving to advanced parts of a topic, make sure you have grasped all of the basics. Also, instead of reading through the book, apply active learning by solving problems and dissecting concepts. Aside from that, it won’t hurt to participate in group studying, seek clarifications, stay organized and practice whenever you have free time.
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