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Introduction to Physics _ Physics in Everyday Life _ Letstute
WEBVTT Kind: captions Language: en
00:00:02.510 hi there friends in this session we will 00:00:06.01900:00:06.029 be introduced to a whole new world a 00:00:08.53000:00:08.540 world of physics in this beautiful 00:00:13.22000:00:13.230 planet that we call earth there are a 00:00:15.53000:00:15.540 lot of interesting events that take 00:00:17.59900:00:17.609 place these events are around us which 00:00:21.71000:00:21.720 we see or do or experience almost 00:00:24.76900:00:24.779 regularly at some point in time your 00:00:29.08900:00:29.099 curiosity would have definitely got the 00:00:31.09900:00:31.109 better of you and would have pushed you 00:00:32.90000:00:32.910 to ask questions like what's going on 00:00:34.79000:00:34.800 how does that happen well leaving 00:00:37.37000:00:37.380 miracles apart the answer to all these 00:00:39.83000:00:39.840 questions is physics you see there is 00:00:43.61000:00:43.620 more to events in our everyday lives 00:00:45.26000:00:45.270 than what meets the eye 00:00:47.41000:00:47.420 so to appreciate the events that you see 00:00:50.95900:00:50.969 you have to first understand events that 00:00:53.77900:00:53.789 you don't see confused don't worry 00:00:57.35000:00:57.360 let's make it simple by looking into 10 00:00:59.86900:00:59.879 of our everyday life examples at random 00:01:05.95000:01:05.960 we all know what that sound is don't we 00:01:09.01000:01:09.020 it is a very annoying yet important 00:01:12.59000:01:12.600 sound which tells us that we have to be 00:01:14.87000:01:14.880 up and about we wake up in the morning 00:01:18.23000:01:18.240 at the sound of the alarm sound is 00:01:21.17000:01:21.180 something which we can't see but can 00:01:23.60000:01:23.610 hear our experience it is used in 00:01:26.53900:01:26.549 important medical equipment like the 00:01:28.16000:01:28.170 ultrasound scanner and by ships to 00:01:31.13000:01:31.140 estimate the depth of the ocean physics 00:01:35.71900:01:35.729 studies the origin propagation and 00:01:38.12000:01:38.130 properties of sound let's make a note of 00:01:41.71900:01:41.729 this event of sound and other events yet 00:01:45.02000:01:45.030 to come in the session before we define 00:01:47.27000:01:47.280 what physics is in the end to have a cup 00:01:53.42000:01:53.430 of coffee we boil water after turning on 00:01:57.56000:01:57.570 the stove we notice that the water is 00:01:59.60000:01:59.610 hot enough when it starts boiling and 00:02:01.60900:02:01.619 when we see steam this gradual rise in 00:02:05.53900:02:05.549 temperature that causes the water to 00:02:07.49000:02:07.500 bubble and later changed to steam is 00:02:09.88900:02:09.899 called heat thus we get hot water 00:02:14.26000:02:14.270 by heating that is increasing the 00:02:17.26000:02:17.270 temperature of water heat is used in the 00:02:21.22000:02:21.230 industry to melt metal and make various 00:02:24.25000:02:24.260 types of heavy-duty machinery like 00:02:26.44000:02:26.450 automobiles and generators it is also 00:02:30.25000:02:30.260 used in household appliances like the 00:02:32.26000:02:32.270 electric or steam iron heat and its 00:02:35.50000:02:35.510 properties is an important topic of 00:02:37.48000:02:37.490 physics as well while we take a walk in 00:02:41.65000:02:41.660 the park on a tar road we have a good 00:02:44.92000:02:44.930 grip without slipping because of a sort 00:02:48.67000:02:48.680 of roughness or resistance between the 00:02:50.83000:02:50.840 soles of our shoes and the surface of 00:02:52.78000:02:52.790 the road this resistance that's 00:02:55.99000:02:56.000 responsible for grip is called friction 00:02:58.30000:02:58.310 or traction but say if we're busy on our 00:03:03.49000:03:03.500 cellphones or waving at our friends and 00:03:05.89000:03:05.900 we do not notice a banana peel in front 00:03:08.47000:03:08.480 of us what makes us fall well apart from 00:03:13.63000:03:13.640 our absent mindedness it is due to the 00:03:16.45000:03:16.460 reduced friction between our shoes and 00:03:18.67000:03:18.680 the road because of the slippery banana 00:03:20.77000:03:20.780 peel friction which is an important 00:03:24.04000:03:24.050 factor in the making of tires is also 00:03:26.98000:03:26.990 explained by physics we have all 00:03:34.48000:03:34.490 observed apples falling from a tree or 00:03:37.47000:03:37.480 balloons floating away in air how is 00:03:40.96000:03:40.970 this possible 00:03:42.13000:03:42.140 the apples fall down while the balloons 00:03:45.01000:03:45.020 float up this is nothing to be puzzled 00:03:47.53000:03:47.540 about the answer is simple our earth has 00:03:51.69900:03:51.709 a kind of a pole that draws every object 00:03:54.25000:03:54.260 to its surface this pole is called 00:03:57.37000:03:57.380 gravity or gravitational force which 00:04:00.49000:04:00.500 keeps every object grounded to the 00:04:02.68000:04:02.690 surface of the earth and prevents them 00:04:04.84000:04:04.850 from floating away this is why apples 00:04:07.39000:04:07.400 fall to the ground and why people or 00:04:09.69900:04:09.709 objects on the underside of the earth do 00:04:12.55000:04:12.560 not fall into space so why did the 00:04:15.76000:04:15.770 balloon float away and not fall to the 00:04:17.34900:04:17.359 ground hmm again it's no big deal we 00:04:21.49000:04:21.500 know the air is light so imagine 00:04:24.13000:04:24.140 something which is lighter than air like 00:04:26.11000:04:26.120 say 00:04:27.11000:04:27.120 helium gas filled into the balloon 00:04:29.32000:04:29.330 because it is light it rises to a level 00:04:32.68900:04:32.699 higher than air and thus works against 00:04:36.14000:04:36.150 gravity which now cannot keep the 00:04:38.62900:04:38.639 balloon grounded gravity is studied to a 00:04:41.71900:04:41.729 great extent by astronauts to mimic 00:04:44.60000:04:44.610 conditions in outer space 00:04:45.86000:04:45.870 in fact gravity is the very event that 00:04:49.64000:04:49.650 was studied by Sir Isaac Newton who is 00:04:51.77000:04:51.780 now considered one of the fathers of 00:04:53.57000:04:53.580 physics when we use a compass we notice 00:05:01.79000:05:01.800 that the direction of the needle is 00:05:03.68000:05:03.690 constant that is the needle points in 00:05:07.40000:05:07.410 only one direction not this is because 00:05:12.26000:05:12.270 of a force of attraction between two 00:05:14.51000:05:14.520 oppositely charged ends called magnetism 00:05:16.99000:05:17.000 all materials that follow magnetism can 00:05:20.15000:05:20.160 be termed as magnets did you know that 00:05:23.48000:05:23.490 apart from being just a planet our earth 00:05:25.82000:05:25.830 is actually one big giant magnet the 00:05:29.39000:05:29.400 geographic North Pole of the earth that 00:05:31.31000:05:31.320 is the Arctic region is actually the 00:05:34.79000:05:34.800 magnetic South Pole which attracts the 00:05:37.61000:05:37.620 magnetic north pole of the compass this 00:05:40.87900:05:40.889 is why the compass always points north 00:05:43.12900:05:43.139 no matter where it is we all know 00:05:46.85000:05:46.860 opposites attract 00:05:47.99000:05:48.000 don't we physics looks into the property 00:05:51.58900:05:51.599 of magnetism which is used in modes of 00:05:54.11000:05:54.120 transport like the metro trains and in 00:05:56.99000:05:57.000 parts of electronics speakers 00:06:04.62900:06:04.639 we would have all seen or done at least 00:06:08.21000:06:08.220 a few of these tricks so what makes 00:06:11.96000:06:11.970 objects remain still or maintain its 00:06:15.46900:06:15.479 position even if there is a pull or tug 00:06:17.42000:06:17.430 on it it is the inertia or unwillingness 00:06:21.14000:06:21.150 or laziness of a body to change its 00:06:24.59000:06:24.600 state of rest or motion this means if a 00:06:28.07000:06:28.080 body moves it prefers to remain in 00:06:30.23000:06:30.240 motion and finds it difficult to stop 00:06:32.15000:06:32.160 unless an outside force acts on it 00:06:35.37900:06:35.389 similarly when a body is not moving or 00:06:38.96000:06:38.970 at rest it prefers to stay that way and 00:06:41.96000:06:41.970 finds it difficult to start moving 00:06:43.90900:06:43.919 unless an outside force acts on it this 00:06:48.37900:06:48.389 property of inertia is important for the 00:06:51.59000:06:51.600 automobile industry while mimicking 00:06:54.17000:06:54.180 accidents for safer cars to be 00:06:56.39000:06:56.400 manufactured 00:06:57.08000:06:57.090 thus physics also involves inertia 00:07:07.01000:07:07.020 speaking of tugs or pushes what do we do 00:07:10.49900:07:10.509 when we open or close a door we use 00:07:13.14000:07:13.150 force when the door is heavy we use more 00:07:17.12900:07:17.139 strength to move in which simply means 00:07:19.17000:07:19.180 that we use more force force is 00:07:22.62000:07:22.630 something that we use on a daily basis 00:07:24.93000:07:24.940 in almost all tasks we undertake like 00:07:27.48000:07:27.490 brushing our teeth pushing buttons on a 00:07:29.79000:07:29.800 keyboard or cell phone force is also 00:07:33.02900:07:33.039 involved in various processes like 00:07:35.58000:07:35.590 coughing sneezing and blood flow due to 00:07:39.30000:07:39.310 the contraction of certain muscles in 00:07:41.27900:07:41.289 our body simply put force is nothing but 00:07:45.57000:07:45.580 the pressure exerted by one body on 00:07:47.58000:07:47.590 another body sports like swimming or 00:07:50.85000:07:50.860 running also employ force for this 00:07:54.33000:07:54.340 reason force is also dealt with by 00:07:56.46000:07:56.470 physics let's look into our daily 00:08:02.40000:08:02.410 gadgets like the cell phone what makes 00:08:05.46000:08:05.470 the cell phone work is the electricity 00:08:07.26000:08:07.270 that's supplied by the battery what 00:08:10.32000:08:10.330 charges the battery is the electricity 00:08:12.15000:08:12.160 that's supplied by the power source 00:08:14.68900:08:14.699 electricity as we all know is an 00:08:17.10000:08:17.110 important part of our daily lives a bead 00:08:20.21900:08:20.229 for transportation like buses cars or 00:08:23.10000:08:23.110 trains of appalling or household 00:08:25.32000:08:25.330 appliances like the television the 00:08:27.45000:08:27.460 fridge the microwave or even to watch 00:08:30.54000:08:30.550 this video did you know that our body is 00:08:34.35000:08:34.360 also like an appliance and the part of 00:08:36.60000:08:36.610 runit comes from certain cells which 00:08:38.61000:08:38.620 produce electricity this type of 00:08:41.76000:08:41.770 electricity is called as bio electricity 00:08:44.31000:08:44.320 which we will see in our biology videos 00:08:46.94000:08:46.950 though we all are biological systems the 00:08:50.44900:08:50.459 mechanism of electricity production is 00:08:52.80000:08:52.810 explained by physics remember if 00:08:55.92000:08:55.930 electricity can rock your world 00:08:57.75000:08:57.760 it can also shock your world the many 00:09:00.54000:09:00.550 usages of electricity is enough proof to 00:09:03.32900:09:03.339 justify why we include electricity in 00:09:05.76000:09:05.770 physics 00:09:10.60000:09:10.610 after a while of rain we see a rainbow 00:09:13.64000:09:13.650 in the sky it is beautiful and has seven 00:09:16.85000:09:16.860 different colors this is a property of 00:09:19.43000:09:19.440 light particularly white light though we 00:09:23.21000:09:23.220 call it white light it is actually a 00:09:25.19000:09:25.200 mixture of lights of many different 00:09:26.90000:09:26.910 colors 00:09:27.91000:09:27.920 rainbows are formed due to the splitting 00:09:30.11000:09:30.120 of sunrays which is white light through 00:09:32.30000:09:32.310 raindrops study of light is an important 00:09:35.93000:09:35.940 part of physics because of the various 00:09:37.94000:09:37.950 usages of light like in decorations and 00:09:40.22000:09:40.230 lasers did you know that we are all made 00:09:48.62000:09:48.630 up of many many smaller particles which 00:09:51.20000:09:51.210 we cannot see individually with our 00:09:52.88000:09:52.890 naked eyes or even with a microscope 00:09:55.06000:09:55.070 they are even smaller than the smallest 00:09:57.53000:09:57.540 cell and in fact these are the very 00:09:59.78000:09:59.790 building blocks of cells and everything 00:10:01.40000:10:01.410 in the universe do you know what these 00:10:03.83000:10:03.840 particles are they called atoms two or 00:10:07.67000:10:07.680 more atoms come together to form a 00:10:09.80000:10:09.810 molecule and many molecules come 00:10:12.14000:10:12.150 together to form visible matter just 00:10:15.23000:10:15.240 imagine how many molecules and 00:10:17.30000:10:17.310 consequently how many more atoms we are 00:10:20.18000:10:20.190 made up of billions trillions zillions 00:10:24.01000:10:24.020 even things that we can't see like my 00:10:26.66000:10:26.670 new dust particles are made up of atoms 00:10:28.84000:10:28.850 the theory of atoms and molecules is 00:10:31.82000:10:31.830 involved with the origin of the universe 00:10:33.43000:10:33.440 life on Earth and everything around us 00:10:36.95000:10:36.960 hence physics just cannot do without it 00:10:40.21000:10:40.220 from all of these events let us now 00:10:42.86000:10:42.870 define physics the word physics comes 00:10:46.25000:10:46.260 from the Greek word fiza's meaning 00:10:48.56000:10:48.570 nature and physique meaning knowledge of 00:10:51.32000:10:51.330 nature thus simply put physics is 00:10:55.13000:10:55.140 nothing but the study of nature and the 00:10:57.44000:10:57.450 universe on the whole and the various 00:11:00.14000:11:00.150 occurrences or events taking place in it 00:11:02.41000:11:02.420 for each of the previously mentioned 00:11:04.73000:11:04.740 examples there are other events that are 00:11:07.46000:11:07.470 occurring at the same time which are 00:11:08.99000:11:09.000 invisible or which we haven't considered 00:11:11.38000:11:11.390 physics explains all these unseen events 00:11:14.81000:11:14.820 to its goal is to answer all questions 00:11:17.83000:11:17.840 right from elemental particles like 00:11:20.39000:11:20.400 atoms to gigantic structures like 00:11:23.40000:11:23.410 it gives us an understanding of how and 00:11:26.47000:11:26.480 why things are the way they are the 00:11:29.44000:11:29.450 events mentioned earlier were just minut 00:11:31.63000:11:31.640 examples of how physics is involved in 00:11:33.67000:11:33.680 our everyday lives so now do you see how 00:11:36.51900:11:36.529 important studying physics is physics is 00:11:39.76000:11:39.770 a lot like a mountain which is not 00:11:42.94000:11:42.950 difficult to scale and when you reach 00:11:45.25000:11:45.260 the top the view is beautiful just don't 00:11:48.82000:11:48.830 accept things the way they are follow 00:11:51.88000:11:51.890 your curiosity wide and far please give 00:11:55.15000:11:55.160 us your comments on the session if you 00:11:56.98000:11:56.990 like the session and are interested to 00:11:59.50000:11:59.510 watch more of these sessions click on 00:12:02.07900:12:02.089 the like button and subscribe the let's 00:12:03.67000:12:03.680 toot
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