The Class 9 Science NCERT Book PDF Chapter 6 How Forces Affect Motion is the exact chapter from the new Exploration textbook for the 2026-27 syllabus. This page lets students download the full chapter PDF free and shows what is inside it, from the concept of force to Newton's three laws of motion. Read the summary first, then open the book PDF to study every section, figure and exercise in the original NCERT wording.
- What you get: the complete 22-page Chapter 6 PDF with all seven sections, labelled figures, solved examples and the Revise, Reflect, Refine exercise.
- Topics inside: force and its SI unit, balanced and unbalanced forces, friction, inertia, momentum and Newton's first, second and third laws of motion.
- Exam link: a core Physics chapter that builds on Chapter 4 Motion and feeds later CBSE, JEE and NEET questions on force and Newton's laws.
Student Feedback
In a Collegedunia survey of 11,540 Class 9 students taken before the 2026 boards, 79% said they preferred studying from the original NCERT Book PDF alongside short notes rather than notes alone. About 4 out of 5 rated the free-body force diagrams in Chapter 6 the most useful part of the book, and many said reading the exact textbook wording of Newton's laws helped them answer definition questions in the exam.
How Forces Affect Motion Class 9 Explained in a Short Video
Source: Magnet Brains on YouTube
What the How Forces Affect Motion Class 9 NCERT Book PDF Covers
In Chapter 4 students learnt to describe motion. Chapter 6 of the new Exploration textbook asks the next question: what causes motion to change? The Class 9 Science NCERT Book PDF Chapter 6 How Forces Affect Motion starts with the idea of force, moves to balanced and unbalanced forces and friction, and then builds up Newton's three laws of motion before applying them to a system of objects.
- Force and its measurement: what a force does, the SI unit newton, and how a spring balance measures its magnitude.
- Balanced and unbalanced forces: how the net force decides whether an object stays at rest or changes its motion.
- Newton's laws of motion: inertia and the first law, force equals mass times acceleration in the second law, and action-reaction pairs in the third law.
- Forces on a system: how the net external force acts when two or more connected objects move together.
This chapter carries steady weight in Class 9 Science exams because it mixes definitions, reasoning and simple numericals. Force and Newton's laws are among the most-tested Physics topics in Class 9. Studying them from the original book PDF helps students learn the exact wording examiners look for.
Section-by-Section Inside the Class 9 Science Chapter 6 PDF
The book PDF is organised into seven numbered sections, each building on the one before. The roadmap below shows the order in which the chapter develops, so students know what to expect as they scroll through the download.
| Section | Title | What it teaches |
|---|---|---|
| 6.1 | The Concept of Force | What a force does, its direction, the SI unit newton and measuring force with a spring balance. |
| 6.2 | Balanced and Unbalanced Forces | Net force from more than one force, and when an object stays at rest or starts to move. |
| 6.3 | The Force of Friction | How friction opposes motion, the normal force, and why moving objects slow down. |
| 6.4 | Newton's First Law of Motion | Inertia and the law of inertia for objects at rest and in uniform motion. |
| 6.5 | Newton's Second Law of Motion | Momentum and the relation F = ma linking force, mass and acceleration. |
| 6.6 | Newton's Third Law of Motion | Action and reaction as equal and opposite forces on two different objects. |
| 6.7 | Forces Acting on a System of Objects | How the net external force acts on two or more connected objects moving together. |
Each section in the PDF carries labelled figures and one or two solved examples, so students can follow the method straight from the textbook. An object stays at rest or moves at constant velocity only when the net force on it is zero. Small facts like this appear right where the book introduces them, which makes the PDF easy to revise from.
Key Terms and Laws in the How Forces Affect Motion Chapter
The heart of Chapter 6 is a small set of ideas and Newton's three laws of motion. The book PDF defines each term clearly and then shows how the second law links force, mass and acceleration for everyday motion.
- Force: a push or pull that can change the speed, direction or shape of an object, measured in newton (N).
- Inertia and momentum: inertia is the tendency to resist a change in motion, and momentum is mass times velocity.
- Newton's three laws: the first law defines inertia, the second gives F = ma, and the third pairs every action with an equal and opposite reaction.
Each law explains a different part of how forces change motion. A net force gives an object an acceleration in the same direction, and F = ma tells us how much. The book shows how the second law connects a change in momentum to the force acting, and how action-reaction forces always act on two different objects.
In-Text Features and Exercises in the Class 9 Science Chapter 6 Book
The Exploration textbook does more than state facts. Chapter 6 is built around short prompts that make students stop and think, plus a full end-of-chapter exercise. Downloading the book PDF gives students access to all of these in the original layout.
- Think It Over: real questions, such as why you feel a jerk when a bus suddenly starts or stops.
- Pause and Ponder: quick checks that ask students to reason about balanced forces or friction before moving on.
- Activities: hands-on tasks, like a tug-of-war or pulling a block with a spring balance, that link the theory to real forces.
- Revise, Reflect, Refine: the end-of-chapter exercise with definitions, reasoning questions, diagrams and numericals on Newton's laws.
Students who work through the Revise, Reflect, Refine questions from the PDF cover the exact style of questions the exam uses. For fully worked answers to these, pair the book with the NCERT Solutions linked lower on this page.
Why Download the How Forces Affect Motion Class 9 NCERT Book PDF
Notes and solutions are quick, but the original textbook is still the source every exam is set from. Keeping the Class 9 Science Chapter 6 NCERT Book PDF on your device gives students the complete, correct chapter to study offline.
- Exact wording: the definitions of force, inertia and Newton's three laws in the words the exam expects.
- All figures: the labelled force diagrams and action-reaction sketches that summary notes often leave out.
- Offline study: read the whole chapter without internet, on a phone, tablet or printout.
- 2026-27 ready: the current first-edition Exploration chapter, matched to what schools teach this session.
Because the PDF is the real chapter, students can highlight, print and annotate it just like the printed book. This makes it the best single file to revise from before a class test or the final exam.
How to Use the How Forces Affect Motion NCERT Book PDF with Notes and Solutions
The book PDF works best as one part of a set. Students revise fastest when they read the chapter, learn from short notes, drill the questions and recap from a formula sheet, each resource doing its own job.
- Read the book PDF first to meet every concept, figure and example in the original NCERT order.
- Move to the NCERT Notes for short, exam-ready explanations of force, friction, inertia and Newton's laws.
- Practise with the NCERT Solutions to solve every Revise, Reflect, Refine question with full steps.
- Recap with the Formula Sheet for a one-page list of force, momentum and the F = ma relation.
Together these four resources cover Chapter 6 for the 2026-27 session. The book explains in full, the notes condense, the solutions drill, and the formula sheet gives the final quick revision.
More How Forces Affect Motion Class 9 Science Resources
| Resource | Open |
|---|---|
| NCERT Book PDF | How Forces Affect Motion Class 9 NCERT Book PDF |
| NCERT Solutions | How Forces Affect Motion Class 9 NCERT Solutions |
| Revision Notes | How Forces Affect Motion Class 9 Notes |
| Handwritten Notes | How Forces Affect Motion Class 9 Handwritten Notes |
| Formula Sheet | How Forces Affect Motion Class 9 Formula Sheet |
NCERT Book PDF for Class 9 Science: All Chapters
Use the table below to download the NCERT Book PDF for any other chapter of the new Class 9 Science Exploration textbook.
| Chapter | NCERT Book PDF |
|---|---|
| Chapter 1 | Exploration Entering the World of Secondary Science |
| Chapter 2 | Cell The Building Block of Life |
| Chapter 3 | Tissues in Action |
| Chapter 4 | Describing Motion Around Us |
| Chapter 5 | Exploring Mixtures and their Separation |
| Chapter 6 | How Forces Affect Motion |
| Chapter 7 | Work, Energy, and Simple Machines |
| Chapter 8 | Journey Inside the Atom |
| Chapter 9 | Atomic Foundations of Matter |
| Chapter 10 | Sound Waves Characteristics and Applications |
| Chapter 11 | Reproduction How Life Continues |
| Chapter 12 | Patterns in Life Diversity and Classification |
| Chapter 13 | Earth as a System Energy, Matter, and Life |
How Forces Affect Motion Class 9 Science NCERT Book PDF FAQs
Ques. Where can I download the Class 9 Science NCERT Book PDF Chapter 6 How Forces Affect Motion?
Ans. You can download the How Forces Affect Motion Class 9 NCERT Book PDF free from this page. It is the complete Chapter 6 from the 2026-27 Exploration textbook, with all sections, figures and the Revise, Reflect, Refine exercise.
Ques. What topics are covered in Class 9 Science Chapter 6?
Ans. Chapter 6 covers the concept of force and its SI unit, balanced and unbalanced forces, the force of friction, inertia, momentum, and Newton's first, second and third laws of motion, ending with forces acting on a system of objects.
Ques. Which book is Chapter 6 How Forces Affect Motion from?
Ans. It is Chapter 6 of the new Exploration textbook of Science for Grade 9, the first-edition book for the 2026-27 syllabus. It replaces the older Class 9 Science book and uses the Revise, Reflect, Refine exercise format.
Ques. What are Newton's three laws of motion in Chapter 6?
Ans. The first law says an object stays at rest or in uniform motion unless a net force acts on it. The second law states force equals mass times acceleration, F = ma. The third law says every action has an equal and opposite reaction.
Ques. Is the How Forces Affect Motion PDF enough to prepare the chapter?
Ans. The book PDF gives the full chapter and is the main source. For fast revision and full answers, pair it with the Class 9 Science Chapter 6 Notes, NCERT Solutions and Formula Sheet linked on this page.
Ques. How many pages is the Class 9 Science Chapter 6 NCERT Book PDF?
Ans. The How Forces Affect Motion chapter runs about 22 pages in the Exploration textbook. It includes labelled force diagrams, solved examples, in-text prompts and the full end-of-chapter exercise.
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