Class 9 Science Chapter 7 – Work, Energy, and Simple Machines
NCERT Exploration | Class 9 Science | 2026–27
Class 9 Science Chapter 7 – Work, Energy, and Simple Machines explores how work is done when a force causes displacement and how energy is transferred and transformed in different situations. Students learn about work, the work-energy theorem, kinetic and potential energy, conservation of energy, power, and simple machines. The chapter also introduces the mechanical advantage of pulleys, inclined planes, and levers, connecting scientific concepts with everyday applications.
Table of Contents
📅 Last Updated: August 2026
📘 Syllabus: Based on the latest CBSE Class 9 (2026–27) syllabus
✅ Updated Resources Include:
- Chapter-wise Study Notes
- Free PDF Downloads
- MCQs
Chapter Overview
| Information | Details |
|---|---|
| Class | 9 |
| Subject | Science |
| Textbook | Exploration |
| Chapter | 7 |
| Chapter Title | Work, Energy, and Simple Machines |
| Academic Session | 2026–27 |
| Resources | Notes, Worksheets, Questions, Tests & Revision |
About This Chapter
Class 9 Science Chapter 7 – Work, Energy, and Simple Machines introduces the relationship between force, work, and energy. Students explore when a force does work on an object and learn how work is connected to the transfer of energy. The chapter develops the concepts of kinetic energy, potential energy, mechanical energy, conservation of energy, and power.
The chapter also introduces simple machines, including the pulley, inclined plane, and lever, and explains their mechanical advantage and practical applications.
In this chapter, students explore:
- Concept of Work
- Work Done by a Constant Force
- Work-Energy Theorem
- Forms of Energy
- Mechanical Energy
- Kinetic Energy
- Potential Energy
- Conversion of Potential and Kinetic Energy
- Law of Conservation of Energy
- Power
- Simple Machines
- Mechanical Advantage
- Pulley
- Inclined Plane
- Lever
The chapter provides opportunities to connect these concepts with real-life situations, calculations, investigations, and simple machines used in everyday life.
🎯 Learning Outcomes
After completing Class 9 Science Chapter 7 – Work, Energy, and Simple Machines, students will be able to:
- Define work done by a constant force and state its SI unit.
- Calculate work done using the appropriate mathematical expression.
- State and apply the work-energy theorem.
- Explain the concept of energy and identify its SI unit.
- Identify different forms of energy and describe simple energy transformations in everyday situations.
- Define kinetic energy and derive its mathematical expression.
- Define potential energy for an object raised to a height and derive its mathematical expression.
- Calculate kinetic energy and potential energy using mathematical expressions.
- Explain the conversion between potential energy and kinetic energy for an object in free fall.
- State the law of conservation of energy.
- Define power, state its SI unit, and calculate power using its mathematical expression.
- Identify simple machines, including the pulley, inclined plane and lever.
- Define mechanical advantage and calculate its value for simple machines.
- Demonstrate and explain how simple machines provide mechanical advantage.
These learning outcomes follow the official Class 9 Science 2026–27 syllabus for Work, Energy and Simple Machines.
🔑 Key Topics
- Concept of Work
- Work Done by a Constant Force
- Work-Energy Theorem
- Forms of Energy
- Mechanical Energy
- Kinetic Energy
- Potential Energy
- Conversion of Kinetic and Potential Energy
- Conservation of Energy
- Power
- Simple Machines
- Pulley
- Inclined Plane
- Lever
- Mechanical Advantage
⭐ Class 9 Science Chapter 7 Study Resources
📌 Important Questions
Most important questions to prepare for exams and chapter revision.
🎯 Competency-Based Questions
Application-focused questions designed to develop deeper understanding.
🧮 Numerical Problems
Practice problems based on force, mass, acceleration, friction and Newton’s laws.
🎁 Free Class 9 Worksheets
Try our free printable Class 9 worksheets before exploring the complete practice packs.
Class 9 Science – Chapter 7: Free Sample Worksheet Questions + Answer Key
NCERT Exercise Solutions
Practise the questions from Chapter 7 and check your answers with our step-by-step solutions.
Chapter 7 – NCERT Exercise Solutions
Why Students Choose Our Class 9 Science Resources?
2026–27 Focused
Printable PDFs
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Chapter-Wise Resources
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Answer Keys
❓FAQ
Q1. What textbook is used for Class 9 Science in 2026–27?
Answer about the new NCERT Exploration textbook.
Q2. Which chapter is this page about?
Chapter 7 of Exploration is Work, Energy, and Simple Machines
Q3. Are these NCERT textbook copies?
No. Our worksheets, notes and practice materials are independently created learning resources. They are designed to support students studying the NCERT curriculum.
Q4. Are the worksheets free?
Explain which resources are free and which may be available as complete practice resources.
Q5. Are answer keys included?
Explain depending on the particular resource.
Q6. Are these resources suitable for school revision?
Yes.
Q7. Will more Chapter 7 resources be added?
Yes. New resources may be added as they are developed.
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