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Notes on Work, Energy and Power NCERT Class 9 for CBSE

## Notes on Work, Energy and Power NCERT Class 9 for CBSE

Table of Contents Work Energy Power Work (w) Work is said to be done when a force is applied on a body and the body displaces from its initial position. w = F x s Types of Work (Positive, Negative, Zero) Positive Work Done: When the displacement is in the direction of the force applied. Ex: A boy pulls an object towards himself. Negative Work Done: If the displacement is in the opposite direction of force applied. Ex: When you’re…

Units & Measurement (GA Physics) Notes for SSC CGL, CHSL & Railways

## Units & Measurement (GA Physics) Notes for SSC CGL, CHSL & Railways

Table of Contents Physical Quantity SI Units SI Base Units SI Derived Units Other Units Practical Units Measuring Devices Physical Quantity A physical quantity is a physical property of a phenomenon, body, or substance, that can be quantified by measurement. A physical quantity can be expressed as the combination of a magnitude (expressed by a number – usually a real number) and a unit. Unit of measurement A unit of measurement is a definite magnitude of a quantity, defined and…

Sound Notes for SSC CGL, CHSL, IB & Railways Exams

## Sound Notes for SSC CGL, CHSL, IB & Railways Exams

Sound Sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. 1 kHz = 1000 Hz Sound can not travel through vacuum. Sound waves are longitudinal waves. Frequency Range of Audible Sound for Humans: 20 Hz to 20 kHz Children under the age of five and some animals, such as dogs can hear up to 25 kHz. Table of Contents Infrasound Ultrasound Mach Number Characteristics of…

Thermodynamics (GA Physics) Notes for SSC CGL, CHSL, IB & Railways

## Thermodynamics (GA Physics) Notes for SSC CGL, CHSL, IB & Railways

Thermodynamics The branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy. First Law of Thermodynamics The total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created nor destroyed. Its a version of the law of conservation of energy, adapted for thermodynamic systems. ΔQ…

Optics (GA Physics) Notes for SSC CGL, CHSL & Railways

## Optics (GA Physics) Notes for SSC CGL, CHSL & Railways

Optics (Ray Optics, Wave Optics) Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. Speed of Light: 3 x 108 ms-1 Time for light to reach on Earth from Sun: 8 minute 20 seconds When light falls…

Force & Laws of Motion Notes | SSC CGL, CHSL | Railways | IB

## Force & Laws of Motion Notes | SSC CGL, CHSL | Railways | IB

Force (F) A force is any interaction that, when unopposed, will change the motion of an object. F = m x a A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. Vector quantity SI unit: N CGS Unit: dyne 1N = 1 Kg m s-2 1N = 105 dyne Balanced and Unbalanced Forces: Balanced forces do not cause a change in motion…

Motion (Kinematics) Notes for SSC CGL, CHSL & Railways 2019

## Motion (Kinematics) Notes for SSC CGL, CHSL & Railways 2019

Motion When an object changes its position with respect to its surroundings with time. Rest When an object doesn’t change its position with respect to its surroundings with time. NOTE: Rest and position are relative terms, i.e., an object in one situation can be at rest but in other situation same object can be in motion. No force is required for an object to be in uniform motion. TYPES OF MOTION 1. Rectilinear Or Translatory Motion When a particle or…

Physics Quiz #1

## Physics Quiz #1

Can you score 16 out of 20? Pradeep SinghThe owner of Eduonine 24. He likes to create notes and write about various things happening in the Indian Education System. https://psrajput.com/