Physics

• Father of Physics → Isaac Newton
• SI unit of force → Newton
• SI unit of work → Joule
• SI unit of power → Watt
• SI unit of energy → Joule
• SI unit of temperature → Kelvin
• SI unit of electric current → Ampere
• SI unit of frequency → Hertz
• SI unit of pressure → Pascal
• SI unit of resistance → Ohm

• First Law → Law of Inertia
• Second Law → F = ma
• Third Law → Every action has equal and opposite reaction
• Inertia depends upon → Mass
• Force changes → Motion of body
• Gravity pulls objects towards Earth
• Acceleration due to gravity on Earth → 9.8 m/s²
• Weight of body changes with → Gravity

• Work = Force × Distance
• Energy is the capacity to do → Work
• Power = Work / Time
• Kinetic energy depends on → Motion
• Potential energy depends on → Position
• Commercial unit of electricity → Kilowatt-hour
• 1 Horsepower = 746 Watt
• Energy cannot be created or destroyed

• Normal human body temperature → 37°C
• Clinical thermometer range → 35°C to 42°C
• Heat flows from → Hot body to cold body
• Boiling point of water → 100°C
• Freezing point of water → 0°C
• Thermometer invented by → Galileo
• Heat transfer by → Conduction, convection & radiation
• Black objects absorb more → Heat

• Sound travels fastest in → Solids
• Human audible range → 20 Hz to 20,000 Hz
• Echo caused by → Reflection of sound
• SONAR uses → Sound waves
• Ultrasound used in → Medical imaging
• SI unit of frequency → Hertz
• Noise pollution measured in → Decibel
• Pitch depends on → Frequency

• X-rays discovered by → Wilhelm Roentgen
• Radioactivity discovered by → Henri Becquerel
• Laser stands for → Light Amplification by Stimulated Emission of Radiation
• Solar cell converts → Solar energy into electricity
• Nuclear energy obtained from → Atomic reactions
• Radar uses → Radio waves
• Satellites used for → Communication & weather forecasting
• Fiber optics use → Light transmission

• Pressure cooker works on → Steam pressure
• Ceiling fan converts → Electrical energy into mechanical energy
• Refrigerator works on → Cooling principle
• Mirror used in vehicles → Convex mirror
• Magnifying glass uses → Convex lens
• Electric bulb converts → Electrical energy into light energy
• Hydroelectricity generated from → Water energy
• Solar panels convert → Sunlight into electricity

• Force = Mass × Acceleration
• Speed = Distance / Time
• Work = Force × Distance
• Power = Work / Time
• Density = Mass / Volume
• Momentum = Mass × Velocity
• Voltage = Current × Resistance
• Pressure = Force / Area

• Newton’s Laws
• Motion & Force
• Heat & Temperature
• Light & Reflection
• Sound & Waves
• Electricity & Magnetism
• Modern Physics
• Units & Measurements
• Scientific Instruments
• Important Discoveries

Learn Basic Concepts

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Understand Motion & Energy

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Study Heat, Light & Sound

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Revise Electricity & Formulas

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Practice MCQs Daily

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Boost GK Preparation