PHYSICS KSSMD I C T I O N A R Y & F O R M U L A

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Derived quantities Physical quantity obtained from the combination of base quantities through multiplication or division or both

CHAPTER 1 F4M E A S U R E M E N T

Base quantities Physical quantities that cannot be defined in terms of other quantities

Physical quantities Quantities that can be measured

Base units Units that cannot be defined in terms of other units

Derived units Units which are obtained from the combination of base units through multiplication or division or both

Consistency The ability (of a measuring instrument) to measure a quantity with little or no deviation among the measurements

Accuracy The closeness of a measurement to the actual value

Sensitivity The ability (of a measuring instrument) to detect a small change in the quantity to be measured

Vector quantity Physical quantities that have both magnitude and direction

Scalar quantity Physical quantities that have magnitude only

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CHAPTER 1 F4M E A S U R E M E N T

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CHAPTER 1 F4M E A S U R E M E N T

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Approximate Values of Some Measured Lengths

Speed Rate of change of distance

CHAPTER 2 F4F O R C E & M OT I O N I

Displacement The distance between two locations measured along the shortest path connecting them in a specified direction

Distance The total path length travelled from one location to the other

Velocity Rate of change of displacement

Acceleration Rate of change of velocity

Deceleration Rate of decrease in velocity

Inertia The tendency of the object to remain at rest or if moving to continue its motion in straight line

Mass The quantity of matter in an object

Momentum Product of mass and velocity

Principle of conservation of momentum In a closed system, the total momentum before collision is equal to the total momentum after collision provided there is no external force

Elastic collision A collision in which the objects do not combine after collision

Inelastic collision A collision in which the objects are combined after collision

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CHAPTER 2 F4F O R C E & M OT I O N I

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CHAPTER 2 F4F O R C E & M OT I O N I

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Impulse Change in momentum

CHAPTER 2 F4F O R C E & M OT I O N I

Impulsive force Rate of change of momentum

Force An agent that can change the shape, velocity and displacement of an object

Gravitational field The region around the earth which an object experiences a force towards the centre of earth

Gravitational field strength The gravitational force acting on a mass of 1 kg placed at that point

Gravitational acceleration The acceleration of an object due to the pull of the gravitational force

Free fall The motion in which the object falls due to gravitational force only

Weight The gravitational force acting on the object

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CHAPTER 2 F4F O R C E & M OT I O N I

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CHAPTER 2 F4F O R C E & M OT I O N I

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CHAPTER 2 F4F O R C E & M OT I O N I

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Kepler’s First Law (Law of Orbits) All planets move in elliptical orbits with the Sun at one focus

CHAPTER 3 F4G R AV I TAT I O N

Centripetal force For a body in circular motion, a force acts on the body in a direction towards the centre of the circle

Gravitational force universal force that it acts between any two bodies in the universe

Kepler’s Second Law (Law of Areas) A line that connects a planet to the Sun sweeps out equal areas in equal times

Kepler’s Third Law (Law of Period) The square of the orbital period of any planet is directly proportional to the cube of the radius of its orbit

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CHAPTER 3 F4G R AV I TAT I O N

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Gravitational force between two bodies

CHAPTER 3 F4G R AV I TAT I O N

Relating Gravitational Acceleration, g on the Surface of the Earth with

Newton’s Second Law of Motion

...1Newton’s Universal Law of Gravitation

substitute 1 in 2

...2

r

RAt height, h from the surface of the Earth, distance from the centre of the Earth: r = R + h

CHAPTER 3 F4G R AV I TAT I O N

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h

CHAPTER 3 F4G R AV I TAT I O N

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Centripetal Force in the Motion of Satellites and Planets

Linear speed shows how fast a body moves in a circular motion

...2substitute 1 in 2

...1

Newton’s Universal Law of Gravitation

Centripetal force

Equate two equations

Mass of the Earth and the Sun

Mass of the Earth

CHAPTER 3 F4G R AV I TAT I O N

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Formulating Kepler’s Third Law

G R AV I TAT I O NCHAPTER 3 F4

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Kepler’s Third Law(Law of Period)

Solving Problems Using Kepler’s Third Law Formula

CHAPTER 3 F4

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G R AV I TAT I O N

CHAPTER 3 F4

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G R AV I TAT I O N

Lower fixed point (ice point) The temperature at which pure ice melts under standard atmospheric pressure

CHAPTER 4 F4H E AT

Thermal equilibrium The situation in which two objects which are in thermal contact have the same rate of heat transfer and the same temperature The NET heat flow between the two objects is zero

Upper fixed point (steam point) The temperature of steam from pure water that is boiling standard atmospheric pressureHeat capacity The amount of heat required to increase the temperature of an object by 1°C

Specific heat capacity The amount of heat that must be supplied to an object of mass 1 kg to increase its temperature by 1°C

Specific latent heat of fusion The amount of heat required to change 1 kg of a substance from solid to liquid without any change in temperature

Specific latent heat of vaporization The amount of heat required to change 1 kg of a substance from liquid to gas without any change in temperature

Boyle’s Law For a fixed mass of gas, the pressure of the gas is inversely proportional to its volume when the temperature is kept constant

Charles' Law For a fixed mass of gas, the volume of the gas is directly proportional to the absolute temperature of the gas when the pressure is kept constant

Gay-Lussac’s Law For a fixed mass of gas, the pressure of the gas is directly proportional to the absolute temperature of the gas when the volume is kept constant

Absolute zero The lowest temperature in theory in which the pressure and the kinetic energy of gas molecules are zero

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CHAPTER 4 F4H E AT

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CHAPTER 4 F4H E AT

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Vibration / oscillation A uniform to –and-fro motion of an object / particle from a vibrating source

CHAPTER 5 F4W AV E S

Wave A traveling disturbance from a vibrating or oscillating source which carries energy along with it in the direction of the propagation

Longitudinal wave A wave in which the particles of the medium oscillate in the direction parallel to the direction in which the wave moves (eg: sound)

Transverse wave A wave in which the particles of the medium oscillate in the direction perpendicular to the direction in which the wave moves (eg: water, light, all EM waves)

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Wavefront An imaginary line that joins all identical points on a wave

One complete oscillation The to-and-fro motion of an object / particle from one particular point

Damping Energy loss from an oscillating system to the surrounding in the form of heat energy

Natural frequency The frequency in which an oscillating system vibrates when no external force is applied

Resonance The phenomena in which an oscillating system is driven at its natural frequency by a periodic force. Maximum energy transfer occurs to the system and it oscillates at a large amplitude

CHAPTER 5 F4W AV E S

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CHAPTER 5 F4W AV E S

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CHAPTER 5 F4W AV E S

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Reflection of wave The phenomena when all or part of the wave return after they encounter an obstacle known as reflector

Refraction of wave The phenomena in which there is a change of direction of propagation due to a change of speed when water waves travel one area to another of different depths

Diffraction of wave The phenomena that refers to the spreading out of waves when they move through a gap or round an obstacle

Interference of wave The phenomena in which two sets of coherent waves meet / combine

Coherent wave Waves which maintain a constant phase difference, amplitude and frequency

CHAPTER 5 F4W AV E S

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Principle of Superposition The combined wave forms of two or more interfering waves waves is given by the sum of the displacement of the individual wave at each point of the medium

CHAPTER 5 F4W AV E S

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Experiment to study the interference of water wave

The combination / superposition of two coherent waves in which the vertical displacements of the two waves are in the same direction

The combination / superposition of two coherent waves in which a positive displacement of a wave meets a negative displacement of another wave and the combined amplitude becomes zero

CHAPTER 5 F4W AV E S

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Electromagnetic waves The electric and magnetic field vibrate perpendicular to each other and to the direction of propagation

CHAPTER 6 F4L I G H T

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Refraction of light The bending of light ray at the boundary as it travels from one medium to

Refractive index, n determines the degree to which light bends when traveling from vacuum to a medium

Law of refraction The incident ray, the refracted ray and normal all lie in the same plane. The ratio of sin i / sin r is a constant (Snell’s Law)

CHAPTER 6 F4L I G H T

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Hh

Real depth The distance of the real object from the surface of a medium (eg: water, glass)

Apparent depth The distance of the virtual image from the surface of the medium (eg: water, glass)

Critical angle, c is the angle of incidence in the medium of high optical density when the angle of refraction in the medium of lower optical density is equals to 90 degree

light travel from higher density to low density i > c

CHAPTER 6 F4L I G H T

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CHAPTER 6 F4L I G H T

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Real image The image that can be formed / displayed on a screen

Virtual image The image that cannot be formed on a screen

CHAPTER 6 F4L I G H T

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Focal point , F of a lens A common point on the principal axis where all the rays parallel to the axis converge to it after passing through a convex lens or appear to diverge from it after passing through a concave lens

Power of lens The reciprocal of the focal length

Focal length, f The distance between the focal point and the optical centre

CHAPTER 6 F4L I G H T

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Linear magnification The ratio of the image size to the object size OR the ratio of the image distance to object distance

CHAPTER 6 F4L I G H T

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Law of reflection The incident ray, the reflected ray and the normal all lie in the same plane The angle of incidence is equal to the angle of reflection

Principle axis of a curved mirror The line passing through the vertex, P and the centre of curvature, C

CHAPTER 6 F4L I G H T

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converging diverging