🧲 Class 9 Science Chapter 8: Force and Laws of Motion 📚 Full Notes, MCQs, FAQs English+ Hindi By BASTRONAUTWAY
🧲 Class 9 Science Chapter 8: Force and Laws of Motion 📚 Full Notes, MCQs, FAQs English+ Hindi By BASTRONAUTWAY
👨🏫 Prepared by: Grandmaster Bikram Sutradhar | SirBikramSutradhar
📘 Chapter Introduction – English SirBikramSutradhar bAstronautWay Chapter 8: Force and Laws of Motion
This chapter introduces the concept of force and explains Newton’s three laws of motion. It helps us understand how objects move or stop, and the reasons behind their motion. These concepts are the foundation of classical mechanics.
📘 अध्याय की प्रस्तावना – हिंदी
यह अध्याय बल की अवधारणा को प्रस्तुत करता है और न्यूटन के गति के तीन नियमों को समझाता है। यह हमें यह समझने में मदद करता है कि वस्तुएँ कैसे चलती हैं या रुकती हैं और उनके गति के पीछे क्या कारण होते हैं। ये अवधारणाएँ यांत्रिकी का आधार हैं।
✅ Key Concepts / मुख्य विषय
📌 English:
- What is force?
- Balanced and Unbalanced Forces
- Newton’s First Law of Motion (Law of Inertia)
- Newton’s Second Law of Motion (F = ma)
- Newton’s Third Law of Motion (Action-Reaction)
- Inertia and Mass
- Momentum and Law of Conservation of Momentum
- Mathematical formulas and graphs
📌 हिंदी में:
- बल क्या है?
- संतुलित और असंतुलित बल
- न्यूटन का दूसरा नियम (F = ma)
- न्यूटन का तीसरा नियम (क्रिया-प्रतिक्रिया)
- जड़त्व और द्रव्यमान
- संवेग और संवेग संरक्षण का नियम
- गणितीय सूत्र और ग्राफ
🧠 Important Formulas / महत्वपूर्ण सूत्र
| English | हिंदी |
| Force (F) = mass × acceleration | बल (F) = द्रव्यमान × त्वरण |
| Momentum (p) = mass × velocity | संवेग (p) = द्रव्यमान × वेग |
| F = rate of change of momentum | F = संवेग परिवर्तन की दर |
📝 Sample Bilingual MCQs
Q1. Which law explains the relationship between force, mass, and acceleration?
🔘 (a) Newton’s First Law
🔘 ✅ (b) Newton’s Second Law
🔘 (c) Newton’s Third Law
🔘 (d) Law of Gravitation
💬 Answer: (b) Newton’s Second Law – F = ma
प्रश्न 1: कौन-सा नियम बल, द्रव्यमान और त्वरण के बीच संबंध बताता है?
🔘 (a) न्यूटन का पहला नियम
🔘 ✅ (b) न्यूटन का दूसरा नियम
🔘 (c) न्यूटन का तीसरा नियम
🔘 (d) गुरुत्वाकर्षण का नियम
💬 उत्तर: (b) न्यूटन का दूसरा नियम – F = ma
❓ Top 10 FAQs – Force & Laws of Motion (Bilingual)
| No. | English Question | हिंदी प्रश्न | Bilingual Answer |
| 1 | What is a force? | बल क्या है? | A force is a push or pull on an object / बल एक वस्तु पर लगने वाला धक्का या खींचाव होता है। |
| 2 | |||
| 3 | State Newton’s First Law. | न्यूटन का पहला नियम बताओ। | An object remains in rest or motion unless acted upon by an external force / जब तक कोई बाहरी बल न लगे, वस्तु विश्राम या गति की स्थिति में रहती है। |
| 4 | Define momentum. | संवेग क्या है? | Product of mass and velocity / द्रव्यमान और वेग का गुणनफल |
| 5 | Which quantity is conserved in a collision? | टक्कर में कौन-सी राशि संरक्षित रहती है? | Momentum / संवेग |
| 6 | What is the unit of force? | बल की इकाई क्या है? | Newton (N) / न्यूटन (N) |
| 7 | What happens when balanced forces act? | संतुलित बलों के प्रभाव में क्या होता है? | No change in motion / गति में कोई परिवर्तन नहीं होता |
| 8 | What causes acceleration? | त्वरण का कारण क्या है? | Unbalanced force / असंतुलित बल |
| 9 | Give Newton’s Third Law. | न्यूटन का तीसरा नियम बताओ। | Every action has an equal and opposite reaction / प्रत्येक क्रिया की समान और विपरीत प्रतिक्रिया होती है। |
| 10 | Give an example of Newton’s Third Law. | न्यूटन के तीसरे नियम का उदाहरण दो। | Jumping off a boat – boat moves backward / नाव से कूदने पर नाव पीछे हटती है |
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| 🌐 Bilingual Format | English + Hindi to suit all learners |
| 📝 MCQs + FAQs | Practice for exams |
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• Chapter 9: Gravitation – Notes & Diagrams
• Numerical Practice Sheets
• Animated Video Summary
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NCERT Solutions
CBSE Class 10 Mathematics (2025) NCERT Syllabus:
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Mathematics NCERT Syllabus (2025) – Chapter-Wise List
chapter 4. Quadratic Equations
chapter 5. Arithmetic Progressions
chapter 6. Triangles
chapter 7. Coordinate Geometry
chapter 8. Introduction to Trigonometry
chapter 9. Some Applications of Trigonometry
chapter 11. Areas Related to Circles
chapter 12. Surface Areas and Volumes
class 10 science ncert solution
CBSE Class 10 Science (2025) NCERT Syllabus:
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
CBSE Class 10 Science NCERT Syllabus (2025) – Chapter-Wise List
Chapter 1 Chemical Reactions and Equations
Chapter 2 Acids, Bases and Salts
Chapter 3 Metals and Non-metals
Chapter 4 Carbon and its Compounds
Chapter 5 Life Processes
Chapter 6 Control and Coordination
Chapter 7 How do Organisms Reproduce?
Chapter 8 Heredity
Chapter 9 Light – Reflection and Refraction
Chapter 10 The Human Eye and the Colourful World
Chapter 11 Electricity
Chapter 12 Magnetic Effects of Electric Current
Chapter 13 Our Environment
📖 Chapter 12 – Organic Chemistry (Selina Textbook)
Table of Contents:
- 12A. Organic Compounds
- 12B. Hydrocarbons: Alkanes
- 12C. Hydrocarbons: Alkenes
- 12D. Hydrocarbons: Alkynes
- 12E. Alcohols
- 12F. Carboxylic Acids
- Exercise 12 MISCELLANEOUS
- Glossary
- Model Question Paper –
📌 Exercise 12 MISCELLANEOUS – Focus Areas:
🧬 Consolidated practice from the entire Organic Chemistry chapter
🧪 Application-based questions covering alkanes, alkenes, alkynes, alcohols, and carboxylic acids
🧾 Writing structural formulas and chemical equations
💡 Distinguishing reactions, isomer identification, and conversions
📘 Full-syllabus revision to boost conceptual clarity and board exam readiness
Each question in this section is designed to:
✅ Strengthen cross-topic understanding
📝 Prepare students for application-based and reasoning-based questions
🧠 Improve problem-solving speed and exam performance
