insight of physics
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Insight of physicsBy Praveen Kumar Reddy.AAssistant Project ManagerEfftronics systems Pvt Ltd.,
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What is Science ?
Science means observation
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Natural Sciences
PhysicsChemistryBiology
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What is physics ?
Physics is traditionally defined as study of matter and energy and the relationbetween them.
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Physics broadly classified as
Classical mechanicsModern physics
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Classical mechanics
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Central concept of classicalmechanics
Motion
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What it focuses ?
It consists of different physical laws thatdescribe motion of bodies under action of forces.
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Where it is applicable ?
Classical mechanics provide accurateresults when bodies are sufficiently largeand the speed of object is very much less
than speed of light.
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Formulation of classical mechanics
Newtonian mechanicsLagrangian mechanicsHamiltonian mechanics.
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Why these formulations ?
Instead of force , energy is taken as aconcept to describe motion in Lagrangianand Hamiltonian mechanics.
The other formulations are used to easilysolve certain problems easily compared
to Newtonian problems.
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Base of classical mechanics
Newton's three laws of motion form thebasis of classical mechanics.
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Main branches of classicalmechanics
StaticsDynamicsKinematics
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Statics
It is the study of equilibrium and itsrelation to forces.
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Dynamics
Study of motion and its relation withforces.
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Kinematics
It deals with observed motion with outregarding circumstances that caused thismotion.
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What you study in degree ?
Basically Newtonian mechanics regardingthese four types of motion.
Learning rules and its applications insimple events.
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Why iam learning ?
In order to characterize various physical
events with the help of physical laws andmathematics.
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Mathematics for Classical mechanics
Language of Mechanics is Calculus
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Realize why you learn physics ?
Our every day physical events which arein motion is accurately described byclassical mechanics accurately.
You are learning tools for that in yourdegree course.
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Main domains of classical mechanics
Mechanics
Thermo dynamicsElectro magnetismOptics (Geometrical and Optical)
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Why modern physics born ?
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Reasons
By the late 19th cent. most of classicalphysics was complete, and optimisticphysicists turned their attention to what
they considered minor details in thecomplete elucidation of their subject
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Reasons
Several problems, however, provided thecracks that eventually led to theshattering of this optimism and the birth
of modern physics.
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Black body radiation
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Classical mechanics fails to explain this graph. This is calledultraviolet catastrophe.
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Introduction of quantization
Max Planck solved the problem byintroducing quantization.
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What is quantization ?
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Einstein photo electric effect
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Experiments on Atomic structure
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Birth of quantum mechanics
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Quantum mechanics
It will not give absolute valuesThey are based on statisticalinterpretation and explain results based
on probability.
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Quantum mechanics based on
Heisenberg uncertainty principle we cannot calculate position and momentum of a particle simultaneously.
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Quantum mechanics
In the small world (realm of atoms)Quantum mechanics gives set of rules toexplain the behavior of atoms.
They cannot be explained on the basis of classical mechanics.
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Schrodinger equation
Schrodinger equations can be used to findthe behaviour of atoms . It gives strongmathematical treatment.
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Prominent scientists
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Theory of relativity
Einstein created two theories whichshocked the world.
Special theory of relativityGeneral theory of relativity
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Special theory of relativity
No body can travel speed than lightThere is no absolute space.
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When body reaches speed of light
Its length contradictsTime dilatesMass increases
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All these are explained that frames of reference moving with outacceleration .
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General theory of relativity
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General theory of relativity
Here frames undergo accelerationGravity is due to curvature of space-timearound heavy massed bodiesLight bends around that curvature.
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General theory of relativity predicts
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Black hole
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General theory of relativity predicts
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Cosmic micro wave background radiation
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Nuclear physics
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Applications of nuclear physics
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Atomic physics
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Atomic physics
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Particle physics
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Where we are in physics Now ?
Finding new elementary particlesStrengthening standard model of atom.
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Where we are in physics now ?
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Latest theory working on
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Dark matter vs matter
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Society needs physicists badly
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