🌟 Introduction
Physics is one of the most important and scoring subjects for Class 9 CBSE Board students. The CBSE Science paper includes a significant portion of Physics, making it essential for students to have strong conceptual clarity and precise terminology. At Dhingra Classes Nashik, we have compiled the complete list of Physics keywords that every Class 9 CBSE student must master for exam success.
Class 9 Physics (CBSE) covers crucial topics including Motion, Force and Laws of Motion, Gravitation, Work and Energy, Sound, and Matter in Our Surroundings. Understanding Physics keywords and their meanings is essential for writing accurate answers and solving numerical problems correctly.
Physics helps us understand the fundamental laws that govern the universe—from the motion of objects to the behaviour of sound and energy. In Class 9 CBSE, students are introduced to core physics concepts that require precise terminology. This comprehensive guide covers 150+ Physics keywords organized by chapter, making it easy for Class 9 CBSE students to learn and revise before exams.
📚 Why Learning Physics Keywords Is Important for CBSE Students
Before diving into the complete list, let us understand why mastering Physics keywords is crucial for Class 9 CBSE students.
🎯 Benefits of Learning Physics Keywords
✅ Better Exam Answers: Using correct terminology impresses examiners
📝 Improved Understanding: Keywords help students grasp physics concepts
🧠 Easy Revision: Keywords serve as memory triggers during revision
🏆 Higher Scores: Precise use of keywords leads to better marks
📊 Numerical Accuracy: Correct terms help in solving numericals
📊 Answer Writing: Keywords help structure answers effectively
🔬 Practical Knowledge: Understanding physics helps in practical exams
📖 Complete List of Physics Keywords for Class 9 CBSE
🚀 Chapter 1: Motion
| Keyword | Meaning |
|---|---|
| Motion | The change in position of an object with time |
| Rest | The state of an object when it does not change its position |
| Distance | The total path length covered by an object |
| Displacement | The shortest distance between the initial and final positions |
| Speed | The distance covered per unit time |
| Velocity | The displacement per unit time |
| Average Speed | Total distance divided by total time |
| Average Velocity | Total displacement divided by total time |
| Uniform Motion | Motion with constant speed |
| Non-Uniform Motion | Motion with changing speed |
| Acceleration | The rate of change of velocity |
| Retardation | Negative acceleration (deceleration) |
| Uniform Acceleration | Acceleration at a constant rate |
| Non-Uniform Acceleration | Acceleration at a changing rate |
| Scalar Quantity | A quantity with magnitude only |
| Vector Quantity | A quantity with magnitude and direction |
| Distance-Time Graph | A graph showing distance against time |
| Velocity-Time Graph | A graph showing velocity against time |
| Slope | The steepness of a graph |
| Speedometer | An instrument that measures speed |
| Odometer | An instrument that measures distance |
| Equations of Motion | Equations relating velocity, acceleration, and time |
| First Equation of Motion | v = u + at |
| Second Equation of Motion | s = ut + ½at² |
| Third Equation of Motion | v² = u² + 2as |
| Uniform Circular Motion | Motion in a circle with constant speed |
| Centripetal Acceleration | Acceleration directed towards the center |
💪 Chapter 2: Force and Laws of Motion
| Keyword | Meaning |
|---|---|
| Force | A push or pull that changes the state of motion |
| Balanced Forces | Forces that cancel each other out |
| Unbalanced Forces | Forces that cause a change in motion |
| Newton’s First Law | An object remains at rest or in uniform motion unless acted upon by a force |
| Inertia | The tendency of an object to resist change in motion |
| Inertia of Rest | The tendency to remain at rest |
| Inertia of Motion | The tendency to remain in motion |
| Inertia of Direction | The tendency to continue in the same direction |
| Newton’s Second Law | F = ma (Force = mass × acceleration) |
| Momentum | The product of mass and velocity (p = mv) |
| Newton’s Third Law | For every action, there is an equal and opposite reaction |
| Action | The force applied by one object on another |
| Reaction | The force applied by the second object on the first |
| Conservation of Momentum | The total momentum of a system remains constant |
| Impulse | The product of force and time (F × t) |
| Mass | The amount of matter in an object |
| Weight | The force of gravity on an object |
| Friction | The force that opposes motion |
| Static Friction | Friction between stationary surfaces |
| Sliding Friction | Friction between sliding surfaces |
| Rolling Friction | Friction between rolling surfaces |
| Fluid Friction | Friction in fluids |
| Drag | The force of friction in fluids |
| Free Fall | Motion under gravity alone |
| Acceleration due to Gravity | The acceleration caused by gravity (g) |
🌍 Chapter 3: Gravitation
| Keyword | Meaning |
|---|---|
| Gravitation | The force of attraction between objects |
| Universal Law of Gravitation | Every object attracts every other object |
| Gravitational Constant (G) | The constant in the universal law of gravitation |
| Gravity | The force of attraction between an object and the Earth |
| Acceleration due to Gravity (g) | The acceleration caused by gravity |
| Free Fall | Motion under gravity alone |
| Mass | The amount of matter in an object |
| Weight | The force of gravity on an object |
| Weightlessness | The state of being without weight |
| Thrust | The force acting perpendicular to a surface |
| Pressure | The force per unit area |
| Buoyancy | The upward force exerted by a fluid |
| Buoyant Force | The upward force exerted by a fluid |
| Archimedes’ Principle | The buoyant force equals the weight of the displaced fluid |
| Density | Mass per unit volume |
| Relative Density | The ratio of the density of a substance to the density of water |
| Floatation | The ability of an object to float |
| Sinking | The ability of an object to sink |
| Pascal’s Law | Pressure applied to a fluid is transmitted equally |
| Atmospheric Pressure | The pressure exerted by the atmosphere |
| Barometer | An instrument that measures atmospheric pressure |
| Manometer | An instrument that measures pressure |
| Hydrometer | An instrument that measures relative density |
⚡ Chapter 4: Work and Energy
| Keyword | Meaning |
|---|---|
| Work | The product of force and displacement |
| Joule | The SI unit of work and energy |
| Positive Work | Work done in the direction of force |
| Negative Work | Work done opposite to the direction of force |
| Zero Work | Work done when there is no displacement |
| Energy | The capacity to do work |
| Kinetic Energy | The energy of motion (KE = ½mv²) |
| Potential Energy | The energy of position (PE = mgh) |
| Gravitational Potential Energy | The energy due to height |
| Elastic Potential Energy | The energy stored in a stretched object |
| Mechanical Energy | The sum of kinetic and potential energy |
| Conservation of Energy | Energy cannot be created or destroyed |
| Power | The rate of doing work (P = W/t) |
| Watt | The SI unit of power |
| Kilowatt | 1000 watts |
| Horsepower | A unit of power |
| Commercial Unit of Energy | Kilowatt-hour (kWh) |
| Law of Conservation of Energy | Energy can be transformed but not created or destroyed |
🔊 Chapter 5: Sound
| Keyword | Meaning |
|---|---|
| Sound | A form of energy that produces the sensation of hearing |
| Vibration | The to-and-fro motion of an object |
| Medium | The substance through which sound travels |
| Longitudinal Wave | A wave in which particles move parallel to the wave |
| Transverse Wave | A wave in which particles move perpendicular to the wave |
| Compression | The region of high pressure in a sound wave |
| Rarefaction | The region of low pressure in a sound wave |
| Wavelength | The distance between two consecutive compressions |
| Frequency | The number of vibrations per second |
| Hertz (Hz) | The SI unit of frequency |
| Time Period | The time taken for one vibration |
| Amplitude | The maximum displacement of a particle |
| Pitch | The quality of sound that depends on frequency |
| Loudness | The quality of sound that depends on amplitude |
| Quality (Timbre) | The quality of sound that distinguishes different sources |
| Audible Range | The range of frequencies that humans can hear (20 Hz to 20,000 Hz) |
| Infrasonic | Sound below 20 Hz |
| Ultrasonic | Sound above 20,000 Hz |
| Echo | The reflection of sound |
| Reverberation | The persistence of sound due to multiple reflections |
| Speed of Sound | The speed at which sound travels |
| Sonic Boom | The loud sound produced by an object moving faster than sound |
| Supersonic | Speed greater than the speed of sound |
| Sonar | Sound Navigation and Ranging |
| Ultrasound | Sound with frequency above 20,000 Hz |
🌡️ Chapter 6: Matter in Our Surroundings
| Keyword | Meaning |
|---|---|
| Matter | Anything that has mass and occupies space |
| Solid | A state of matter with definite shape and volume |
| Liquid | A state of matter with definite volume but no definite shape |
| Gas | A state of matter with no definite shape or volume |
| Plasma | A state of matter with ionized gas |
| Bose-Einstein Condensate | A state of matter at very low temperatures |
| Evaporation | The change of liquid to gas at any temperature |
| Boiling | The change of liquid to gas at boiling point |
| Melting | The change of solid to liquid |
| Freezing | The change of liquid to solid |
| Condensation | The change of gas to liquid |
| Sublimation | The change of solid directly to gas |
| Deposition | The change of gas directly to solid |
| Latent Heat | The heat absorbed or released during a change of state |
| Latent Heat of Fusion | The heat required to melt a solid |
| Latent Heat of Vaporization | The heat required to vaporize a liquid |
| Diffusion | The mixing of particles of different substances |
| Brownian Motion | The random motion of particles |
| Kinetic Energy | The energy of motion of particles |
| Temperature | The measure of the average kinetic energy of particles |
| Kelvin | The SI unit of temperature |
| Celsius | A unit of temperature |
| Fahrenheit | A unit of temperature |
| Absolute Zero | The lowest possible temperature |
| Interconversion of States | The change from one state to another |
📝 How to Use This Keyword List for CBSE Exam Preparation
At Dhingra Classes Nashik, we recommend the following strategies to master Physics keywords for Class 9 CBSE.
🎯 Study Tips
📖 Read each keyword with its meaning carefully
✏️ Write each keyword 3–4 times to memorize spelling
🗣️ Use keywords in sentences to understand context
📝 Create flashcards for quick revision
📊 Draw diagrams to understand physics concepts
🔄 Revise weekly to ensure long-term retention
📋 Practice numericals using correct formulas
✅ Take mock tests to check your understanding
📊 Focus on high-weightage chapters first
🎯 Use keywords in answer writing practice
📊 Class 9 CBSE Physics Weightage
| Chapter | Expected Marks |
|---|---|
| Motion | 8 – 10 Marks |
| Force and Laws of Motion | 8 – 10 Marks |
| Gravitation | 6 – 8 Marks |
| Work and Energy | 6 – 8 Marks |
| Sound | 6 – 8 Marks |
| Matter in Our Surroundings | 6 – 8 Marks |
🏫 How Dhingra Classes Nashik Helps Class 9 CBSE Students Master Physics
At Dhingra Classes Nashik, we provide comprehensive coaching for Physics and all other subjects for Class 9 CBSE students. Our approach includes:
📚 Structured Lessons: Teaching concepts with clear explanations
📊 Diagram Practice: Regular diagram work for better understanding
📝 Keyword Lists: Providing comprehensive keyword lists like this one
✏️ Regular Tests: Weekly tests to ensure continuous revision
🎯 Doubt Clearing Sessions: Personalized attention to every student
📊 Progress Tracking: Regular updates to parents about student progress
🏆 Numerical Practice: Teaching how to solve problems effectively
📞 Contact Dhingra Classes Nashik
📱 Phone: 98230 62106
📧 Email: dhingraclassesnsk@gmail.com
🌐 Website: www.dhingraclassesnashik.com
📍 Address: Plot No 3, XQ3G+H3M Deacon Homes, 301C, opp. Metro Zone, near Guru Govind Sing, Samarth Nagar, Dnyaneshwar Nagar, Pathardi Phata, Nashik, Maharashtra 422009
🏁 Conclusion
Mastering Physics keywords is essential for Class 9 CBSE students to score high marks in examinations. This comprehensive list of 150+ Physics keywords with their meanings covers all major chapters including Motion, Force and Laws of Motion, Gravitation, Work and Energy, Sound, and Matter in Our Surroundings.
By regularly revising these keywords and using them in your answers, you can improve your understanding and score better in exams. At Dhingra Classes Nashik, we are committed to helping Class 9 CBSE students excel in Physics and achieve academic success. Remember, Physics is not just a subject—it is the study of the fundamental laws of nature, and understanding it makes us better observers of the universe.
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