Overview: Physical World Video Lecture | Physics for Airmen Group X - Airforce X Y / Indian Navy SSR

0:0:0: what is physics
0:0:2: physics is the science of how natural
0:0:4: phenomena occur in the universe by
0:0:6: studying matter
0:0:7: energy
0:0:8: and their interactions through
0:0:10: experiments
0:0:11: measurement and mathematical analysis
0:0:15: we can understand it better by
0:0:17: classifying it under two branches that
0:0:19: is classical physics
0:0:22: and modern physics
0:0:24: let's overview the classical physics
0:0:27: this branch comprises the scientific
0:0:29: advancements and physical theories
0:0:32: developed between 1600 to 1900
0:0:36: mechanics
0:0:37: thermodynamics
0:0:38: electromagnetism
0:0:40: optics and acoustics are the primary
0:0:43: realms developed during this period
0:0:46: mechanics
0:0:48: the science of why and how things move
0:0:50: evolved mainly under british physicist
0:0:53: sir isaac newton who proposed the laws
0:0:55: of motion amp the universal law of
0:0:57: gravitation
0:0:59: dust mechanics is also referred to as
0:1:1: newtonian mechanics
0:1:4: thermodynamics
0:1:6: the science of transfer and exchange of
0:1:8: heat
0:1:9: developed mostly under joule clausius
0:1:12: baltzmann and other such eminent
0:1:14: physicists
0:1:16: electromagnetism
0:1:18: the science of the interplay between
0:1:20: electricity and magnetism
0:1:22: was best studied by the likes of maxwell
0:1:25: faraday
0:1:26: and hertz
0:1:28: optics and acoustics are the two other
0:1:30: realms that highly progressed during
0:1:32: that period
0:1:34: while newton was the pioneer in the
0:1:36: field of optics
0:1:37: christie and hughes further enlightened
0:1:39: us about the nature and behavior of
0:1:41: light
0:1:43: let's now overview the modern physics
0:1:46: in the 20th century
0:1:48: several phenomena were discovered that
0:1:50: classical physics failed to explain
0:1:52: and our understanding of the physics of
0:1:54: the universe was challenged yet again
0:1:57: new theories such as special relativity
0:2:0: and quantum mechanics emerged during
0:2:3: this period
0:2:4: quantum mechanics
0:2:6: it is the hazy science of particles of
0:2:8: the subatomic realm
0:2:10: and how they notoriously change their
0:2:12: behavior just by mere observation
0:2:15: it quantized energy in the form of
0:2:17: discrete packets
0:2:18: called quanta and deals with the
0:2:20: probabilistic or statistical calculation
0:2:22: of these particles
0:2:24: relativistic mechanics is based on the
0:2:27: theory of special relativity and general
0:2:30: relativity
0:2:32: both proposed by the most famous
0:2:33: physicist of our time albert einstein
0:2:37: these theories provided a whole new
0:2:39: understanding of how the universe works
0:2:42: for the sake of our curriculum we will
0:2:44: only study the classical physics and the
0:2:46: basics of modern physics
0:2:48: evolution of physics
0:2:51: in comparison to other sciences such as
0:2:53: mathematics
0:2:54: chemistry
0:2:56: biology and other natural sciences
0:2:59: physics holds an integral place as it
0:3:2: enables us to answer the most important
0:3:4: aspect that is why
0:3:6: and how
0:3:8: and thus advancements in physics lead to
0:3:10: new technologies and vice versa
0:3:13: this has been a common trend in the past
0:3:15: few centuries
0:3:17: for example the laws of thermodynamics
0:3:20: led to the invention of steam engine
0:3:22: newton's laws of motions led to
0:3:24: advancement in rocket propulsion
0:3:27: and the electromagnetic theory gave us
0:3:29: the particle accelerators
0:3:32: fundamental forces of nature
0:3:34: for a true understanding of our physical
0:3:36: world we need a proper understanding of
0:3:39: how different particles interact
0:3:41: fundamentally
0:3:42: under different conditions
0:3:45: to identify such fundamental
0:3:47: interactions or forces scientists use
0:3:49: two major approaches
0:3:51: that is unification
0:3:53: and reduction
0:3:55: currently scientists have identified
0:3:57: four fundamental forces of nature these
0:4:0: are gravitational force
0:4:3: electromagnetic force
0:4:5: strong nuclear force
0:4:7: and
0:4:8: weak nuclear force
0:4:10: the gravitational force
0:4:13: discovered by sir isaac newton it is the
0:4:16: weakest fundamental force that revolves
0:4:18: around the central idea that matter
0:4:20: attracts every other matter
0:4:23: it is also responsible for keeping the
0:4:25: things held together in space
0:4:28: it is a long range force
0:4:30: the electromagnetic force
0:4:33: also a long range force it is the second
0:4:36: strongest fundamental force that acts on
0:4:38: the charged particles
0:4:41: it is responsible for many daily
0:4:43: phenomena such as electricity
0:4:45: communication
0:4:46: and even our ability to touch different
0:4:48: things
0:4:49: since we are as made of matter as well
0:4:51: and matter consist of charged particles
0:4:55: strong nuclear force
0:4:58: 137 times stronger than the
0:5:0: electromagnetic force the strong nuclear
0:5:3: force is the strongest fundamental force
0:5:6: it is responsible for holding the
0:5:8: nucleus of an atom together and is a
0:5:11: short-range attractive force
0:5:14: weak nuclear force
0:5:16: weaker than the strong nuclear force is
0:5:18: it also a short-range force
0:5:21: it is responsible for radioactive and
0:5:23: such other nuclear forces
0:5:25: however
0:5:26: scientists still await the day when the
0:5:28: quest for the grand unification theory
0:5:30: will be over
0:5:32: such a theory will theoretically be able
0:5:34: to explain all the naturally occurring
0:5:36: phenomena
0:5:38: two pieces of this jigsaw have already
0:5:40: been put together as the electromagnetic
0:5:43: force and the weak nuclear force have
0:5:46: been unified
0:5:48: scientists all over over the world are
0:5:50: in a constant struggle to put together
0:5:52: the remaining pieces as well
0:5:54: now you can visit edurev and find other
0:5:57: such exciting videos
0:5:59: documents and practice online tests to
0:6:3: check your understanding of this topic