Table of Contents
Definition
Atomic Physics:
The branch of Physics that deals with the study of the structure and properties of atoms
Definition
Axis of rotation:
A straight line passing through the points of a rotating rigid body while the other points of the body move in circles about the axis.
Definition
Base quantity
A quantity which can be expressed independently without the reference of any other quantity.
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Definition
Coefficient of linear expansion:
Change in unit length caused by unit kelvin change in temperature.
Definition
Centrifugal force:
According to Newton's third law of motion, there exists a reaction to the centripetal force. The centripetal reaction that pulls the string outward is sometimes called the centrifugal force.
Definition
Centripetal force:
The force which keeps the body moving in a circular path is called the centripetal force and is given by:
$F_{c}=\frac{mv^{2}}{r}$
Definition
Circular motion:
The motion of a body moving along a circular path is called circular motion.
Definition
Coefficient of volume expansion
Change in unit volume caused by unit kelvin change in temperature.
Definition
Convection:
Transfer of heat by actual movement of molecules from a hot place to a cold place is known as convection.
Definition
Couple:
When two equal and unlike parallel forces act at different points of a body they constitute a couple.
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Definition
Density:
Density is the ratio of mass to volume of a substance. The density of water is
$1000 kgm^{-3}$.
Definition
Efficiency:
The ratio of the useful work done by a device or machine to the total energy taken up by it is called its efficiency.
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Definition
Elasticity:
The property of matter by which matter resists any force which tries to change its length, shape, or volume is called elasticity.
Definition
Electromagnetism:
The branch of physics deals with the study of the charges at rest and in motion, their effects, and their relationship with magnetism.
Definition
Force of gravitation:
The force due to which everybody in the universe attracts every other body.
Definition
Evaporation:
The changing of a liquid into vapors from the surface of the liquid without heating it.
Definition
Field force:
The gravitational pull of the Earth acts on the body whether the body is in contact with the Earth or not.
Definition
Force of gravitation:
The force due to which everybody in the universe attracts every other body.
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Definition
Geophysics:
The branch of physics deals with the study of the internal structure of the Erath and tectonic plate motions etc.
Definition
Gravitational field:
The field is a region in space in which a particle would experience a gravitational force.
Definition
Gravitational potential energy:
Energy of a body due to its position in the gravitatinal field.
Definition
Heat capacity:
The quantity of thermal energy absorbed by a body for increase in its temperature.
Definition
Heat:
The branch of physics deals with the nature of heat modes of transfer of heat and effects of heat.
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Definition
Internal energy:
The sum of K.E and P.E is associated with the atoms, molecules, and particles of a body.
Definition
Joule:
The amount of work done when a force of one newton displaces a body through one meter in the direction of the force.
Definition
Kinematics:
Study of motion of bodies without taking into consideration the mass and forces.
Definition
Latent heat of fusion:
The heat required by a unit mass of a substance at its melting point to change it from a solid state to a liquid state is called the latent heat of fusion.
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Definition
Latent heat of vaporization:
The quantity of heat required by the unit mass of a liquid at a certain constant temperature to change its state completely from a liquid into a gas is called the latent heat of vaporization.
Definition
Light:
The branch of physics deals with the physical aspects of light and its properties: working and uses of optical instruments.
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Definition
Mass:
The characteristic of a body determines the acceleration produced by the application of a force.
Definition
Mechanics:
The branch of physics deals with the motion of objects, causes, and effects of motion.
Definition
Moment arm:
The perpendicular distance between the axis of rotation and the line of action of the force.
Definition
Negative vector:
A vector which has the same magnitude but opposite direction of another vector.
Definition
Neutral equilibrium:
The condition of a body in which its center of gravity neither rises nor becomes lower than its original position after being disturbed.
Definition
Nuclear physics:
The branch of physics deals with the [properties and behavior of nuclei and the particles within the nuclei.
Definition
Orbital velocity:
The critical velocity of a satellite to keep on moving around the Earth at a specific height.
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Definition
Perpendicular components:
The components of a force are mutually perpendicular to each other.
Definition
Plasma Physics:
The branch of physics deals with the study of production, and properties of the ionic state of the matter-the fourth state of matter.
Definition
Physics:
Physics is a branch of science that deals with matter, energy and their relationship.
Definition
Prefixes:
The words or letters added before a unit and stand for the multiples or sub-multiples of that unit are known as prefixes. For example, kilo, mega, million, micro, etc.
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Definition
Pressure:
Pressure is the normal force acting per unit area. Its SI unit is $Nm ^{-2}$ or pascal (Pa).
Definition
Radiation:
Transfer of heat by infra-red radiators requires no medium for their transmission.
Definition
Rolling Friction:
Rolling friction is the force of friction between a rolling body and a surface over which it rolls. Rolling friction is lesser than the sliding friction.
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Definition
Scalars
Physical quantities which are described by their magnitude only are known as scalars.
Definition
Scientific notation:
The numbers are written as power or prefix of ten in which there is only one non-zero number before the decimal.
Definition
Significant figures:
All the accurately known digits and the first doubtful digit in an expression are called significant figures. It reflects the precision of a measured value of a physical quantity.
Definition
Specific heat capacity:
The quantity of heat changes the temperature of one kilogram of mass by 1 K.
Definition
stability:
The property of a body that does not undergo any change without the application of an external agency.
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Definition
Stable Equilibrium:
The condition of a body in which it comes to its original position after being disturbed.
Definition
Static friction:
The force of friction arises due to an applied external force before motion.
Definition
Tensile strain:
The ratio of change of length to the original length is called tensile strain.
Definition
Thermal conductivity:
The rate of flow of heat across the opposite faces of a meter cube maintained at a difference of 1 K is called the thermal conductivity of the material of the cube.
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Definition
Thermal equilibrium
The property of a system is when all parts of the system have the same temperature along with its surrounding.
Definition
Uniform acceleration:
A body has uniform acceleration if it has equal chances in its velocity in equal intervals of time, however small the interval may be.
Definition
Uniform speed:
If the speed of a body does not change with time then its speed is uniform.
Definition
Uniform velocity:
If a body covers equal displacements in equal intervals of time, however small the interval may be, then its velocity is said to be uniform.
Definition
Unlike parallel forces:
Forces that are parallel but have direction opposite to each other.
Definition
Unstable equilibrium:
If a body does not return to its previous position when set free after a slight tilt is said to be in unstable equilibrium.
Definition
Vectors:
Physical quantities which are described by their magnitude and direction are known as vectors.
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Definition
Velocity:
We define velocity as the rate of change of displacement or speed in a specific direction.
Definition
Watt:
1. The power of a body is one watt which is doing work at the rate of one joule per second.
Definition
Weight:
The weight of a body is the force of gravity acting on it. It is a vector quantity. SI unit of weight is Newton (N).
Definition
Work:
- Work is said to be done when a force acting on a body moves it in the direction of the force.
- Work = FS
- SI unit of work is the joule (J).
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