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# Physics – 09

താപവ്യതിയാനങ്ങൾ, ചലനം, പ്രവേഗം, ത്വരണം, ചലന നിയമങ്ങൾ എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ.

• The process of conversion of a liquid into vapour is known as

Evaporation

• The process of conversion of a solid directly into vapour is known as

Sublimation

• Example of an object showing sublimation

Camphor

• Quantity of heat required to convert unit mass of solid at its melting point into liquid is called

Latent heat of Fusion

• For ice at 0°C, the latent heat of fusion is

80K Cal/kg

• Quantity of heat required to convert unit mass of liquid at its boiling point into vapour is called

Latent heat of vapourisation

• For water at 100°C, the latent heat of vaporisation is

540K Cal/kg

• Device which converts heat energy into mechanical energy

Heat engine

• A body is said to be a perfect blackbody if its

Absorption power is 1

• A surface which absorbs all the heat radiations incident on it is known as

Perfectly black body

• Device used to measure the temperature of sun

Pyrheliometer

• Estimated value of surface temperature of sun is

5778K

• Study of high temperature is known as

Pyrology

• Study of motion is known as

Mechanics

• Study of causes and changes in motion is known as

Dynamics

• Change in position of an object with respect to time and its surroundings is called

Motion

• If an object does not change its position with respect to its surroundings, it is said to be

Stationary

• The distance traveled by a body in unit time is called

Speed (Distance/Time)

• Change in position of an object in a particular direction is called

Displacement

• The distance traveled by a body in a definite direction in unit time is called

Velocity (Displacement/Time)

• The rate of change of velocity of a moving body is called

Acceleration (Change in velocity/Time)

• Slope of velocity time graph gives

Acceleration

• Shape of acceleration versus mass graph for constant force is

Hyperbola

• At terminal velocity the acceleration of body is

Zero

• If the velocity of moving body decreases, the change in velocity is called

Retardation or Deceleration

• Example of one dimensional motion

Throwing a stone straight up

• Example of two dimensional motion

Projectile motion, Boat in a lake, Satellite revolving uniformly around earth

• Example of three dimensional motion

Motion of a charged particle, A kite in air

• If a body is moving in a circular path then the motion is said to be in

Circular motion

• To and fro motion of an object is called

Oscillatory motion

• Example of oscillatory motion

Pendulum of a clock

• If a body is moving in a line then the motion is said to be in

Translational motion or Linear motion

• Translational motion in a straight line is called

Rectilinear motion (Eg: Lift motion)

• Translational motion in a curved path is called

Curvilinear motion (Eg: Motion of rocket in space)

• Motion which repeats after regular intervals of time

Periodic motion (Eg: Rotation of earth around sun)

• If the axis of the rotating body is within the body, its motion is said to be

Spin motion or Rotational motion (Earth spin)

• When an object travels around another object, its motion is known as

Revolution (Eg: Earth travels around Sun)

• Motion of an object in a vertical plane under the influence of gravitational force is known as

Projectile motion

• Projectile path is known as

Trajectory

• Projectile path is always

Parabola

• Projectile reach its maximum range when the angle of projection is at

45°

• The tendency of a body to continue its state of rest or uniform motion along a straight line is called

Inertia

• Law of inertia was discovered by

Galileo

• As the bus starts moving, a man sitting inside leans backward because of

Inertia of rest

• As the bus stops moving, a man sitting inside bend in forwarding direction because of

Inertia of motion

• Rotating wheel throw out mud tangentially outward because of

Inertia of direction

• Force required to stop a moving body depends on

Its mass and velocity

• Uniform acceleration produced in a freely falling body due to the gravitational pull of the earth is known as

Acceleration due to gravity (g=9.8 m/s²)

• In earth acceleration due to gravity is maximum at

Polar regions

• In earth acceleration due to gravity is minimum at

Equatorial regions

• In earth acceleration due to gravity is zero at

Centre of the Earth

(To be Continued…)