Fun with physics

Hey all,  Consider two points A and B separated at a distance of say 5 cm in a piece of paper. If you were to reach point B from A you need to cover 5cm distance. But what if you wrap the paper in such a way that point A and B intersect. Then it becomes a shortcut right. This is exactly the concept behind worm holes. Due to the fabric nature of space-time this can be assumed that we can enter from past to future and vice versa through these holes known as worm holes created due to rupture in space time fabric due to movement of celestial bodies including planets. Time is a man made straight dimension but in our universe time is not moving forward rather everything is happening at the moment. It is like a 3hrs Bollywood movie being watched in a DVD where the time period for movie or event is fixed and we can go backwards and forward. Similarly events occuring in universe are fixed and we can rewind or move ahead using worm holes.  This concept is hypothetical based on journals ...

Hey there,  It's been long I haven't written anything but today I chose to pen-down something very close to my heart, the twin paradox. It was taught to us in 1st semester in physics under the topic special theory of relativity. The story is as under..  There were two twins A and B. They celebrated their birthday on same date every year. But on their 18th birthday A went for a space trip to rotate around a celestial object with a speed nearly 80% of light. He told his brother B that he would come back next year on their birthday when they would be celebrating their 19th birthday. He went for the trip with speed of 0.8c to space and took exactly 1year to return on earth. As he returned he found his brother B was 80 years old. Why this paradox took place? It's because earth revolved 62 years during this time as compared to A's spaceship which took only one year as it was travelling at very high speed. This is a time travel which can occur according to special theory of re...

Hii everyone,  The third differential of displacement wrt time is jerk. First differential being velocity, second being acceleration, third being jerk. I know many of you may not know it and it is not your fault as it is not given much importance but have you ever wondered why shock absorbers are used in your motorbikes or cars. It is to absorb the shock but why it is important? It is important bcz the shock is nothing but jerk and if it is not absorbed the result can be devastating. You know when the external frequency of an object equals it's natural frequency resonance occurs. At resonance max vibrations occur. If in a motorbike or a car the jerk equals the natural frequency of person sitting then the person may collapse due to resonance leading to heart attack. So now you know the importance of shock absorbers.  Thanks... 

Hii, It's been 8 years that I last appeared for AIEEE and PET.But I can share some tips from those exams about how to crack them and score maximum. 1.While talking about PCM Subjects,have full command in any two subjects. 2.While appearing for exam solve those sections first in which you have full command,then go for other questions. 3.If you are doubtful about certain questions,leave them. 4.If negative marking is not there attempat all questions and for the questions,you don't know the answer tick on same option.This will increase probability of getting correct answers.(for no negative marking questions) 5.As far as subjects are concerned,refer NCERT for chemistry.Most of the exams take questions from NCERT. 6. For physics HC Verma is best,then Pradeep and some foreign journals. 7.For mathematics,I practiced RD Sharma but again some foreign author books are required for getting good marks. 8.Always go through previous year questions and try to figure out pattern. 9...

Hello all, Today's blog is divided in two parts- 1.Secondary Level. 2.Senior Secondary Level. As the title suggests an iron needle sinks but ship floats.We are going to discuss the reasons in two different levels targeted at two different groups of students. Talking about secondary level,all the students of class 7th or 8th must have witnessed this question in their science books right.As far as my case is concerned I was in class 8th when this case was discussed in science book in very small part.The reason given for floating of ship and sinking of iron needle made of same material was explained to be related to density.Since iron needle had greater density than water itself so it sank whereas ship floated being less in density compared to water.Thats it.It was supposed to be the answer of 2marks.Then I moved to 9th standard and all of a sudden my father and brother both asked me to answer the same question as they knew in class9th there is mechanics,so they wanted to test m...

Hello all, Welcome back... In today's blog I am going to discuss about the importance of units.We are taught right from childhood that a physical quantity consists of two parts,one being magnitude and other being unit.To specify a physical unit we need both.For eg if someone asks you how much distance did you cover in today's morning walk?You might say 2km.Imagine if you would have said only 2,was it explainable.Answer is no.Similarly only saying km will also not be explainable.That is why both magnitude and units are important.Now this information you will get in primary textbooks also.But can you imagine its practical implications and its repercussions.Let me tell you a story. But before that I would like to emphasize on the importance of SI units.SI units are international standard units designed to maintain uniformity.Imagine what will happen if we neglect its importance.Now here comes a real life story. An aeroplane flew from its source towards it's destination,b...

Hey guys, It's very common that we forget to switch off the main supply when our phone is charged.We leave it on.Now the question is whether there is any power consumption.Theoritically if there is no load there should be no power consumption.But still the charger consumes very minimum amount of energy because the primary winding of the transformer consumes electricity and this is the reason why the charger gets heated after some time.So if this thing happens for few times it's ok but if it is kept on for larger period of time then power consumed is considerable.So make it a habit to turn the mains off once your phone or laptop is charged up. Thanks...

Hello all, From our childhood days we have witnessed that there is a gap after certain intervals on railway tracks.Moreover the two tracks having gap is bolted with a plate.This plate is called fish plate.Now there must be two questions arising in your mind 1st-What is the need of gap? 2nd-What is the use of fish plate? Let's take the 1st question.The need of gap is to compensate the expansion caused due to increase in temperature which would ultimately lead to cracking and we cannot afford it.From the equation of thermal expansion length is directly proportional to temperature. Now come to second question about fish plate.See if we don't join the two tracks with the help of fish plates with adjustable bolts then misalignment will take place while train runs over it.To maintain the alignment in horizontal and vertical directions,the bolts are implemented and are kept bit loose for managing the alignment in horizontal and vertical directions.For more information Google it....

Hey guys, Hope you all are well.Board exams are round the corner.No need to panic just keep calm.Well this post is specifically for class 9th students.In rest and motion chapter you all have witnessed the term inertia.So how will you define it to a layman who does not understand physics that well.If I were in your place I would have told them inertia is nothing but resistance to change of state.This state can be rest or motion.In other words tendency to maintain its original state unless and until the external force completely convinces it or gets hold of it to maintain the new state.We all feel reluctant to sudden change.Take an example of getting up early in morning in a cold winter season.Your body and mind tends to maintain the state of sleep even after the alarm starts ringing unless and until you are compelled to get up.Like humans objects also show resistance to change.It is also said that it is difficult to start a motion than to maintain it.That is why Newton's first law...

Hey, I  am back and hope you all are doing well.Today's post is bit tricky.You all can visualize the particle which can escape earth's gravity without being given the escape velocity.But does it come to your mind suddenly?In my case it didn't.Actually it's bit tricky.By particle we mean particle in nature.We know light escapes earth's gravity.And we also know it is dual in nature,meaning made of particles and waves.Here the particle is nothing but photons which are tiny bags of energy.As it is a constituent of light itself so it escapes earth's gravity.So I hope it's something interesting right. Bye...

Welcome back, Hey guys first of all I want to clarify that I am none to accept or deny about the existence or non existence of black holes.It is a huge topic and already many theories have been put regarding this by great scientists.I will just discuss about my views on existence of black hole. Let's start.. Coming to the basic definition of black hole which states that a black hole is created by a dying star by collapsing under its own mass by getting reduced to nearly zero volume.When a huge mass shrinks in volume in space time fabric it gets penetrated inside it leading to so called hole.But the question is whether the star shrinks to zero volume.If it is so where will the mass exist?The mass can only exist at non zero volume.In my opinion,the black holes when created go deep inside a point,that is the point of singularity.The other case can be that the hole created goes to infinity and never stops at a point. Thanks...

Hello guys, Welcome back.This post is related to thundering and lightening.We all have witnessed lightening in our lives and often wondered the reason behind it.Researchers use high speed and high definition cameras to record lightening and to know its insights.Well here we would discuss about it.It all starts with formation of clouds.When the earth gets heated,the warm air(lighter in density)moves up.After reaching certain height it cools down and converts to clouds.The air above it is much colder which causes formation of ice blocks.This ice blocks when move hapazard,collide with each other and generate electric charges.The upper portion being positive and lower being negative.This negatively charged clouds induce positive charge on ground and electric discharge takes place between clouds and earth.This electrostatic discharge occurs by breaking the insulation property of air.The air is an insulator up to a certain voltage around it.But when millions of volts of energy surrounds it...

Hey guys, It's chilling cold here in this part of the country.What about your country?Today I am going to discuss why Some countries employ 220volt and some 110volt for household consumption.Actually the choice dates back to history when Thomas Edison and his company gave electricity at 110volt DC.Since it was employed first so people had mindset of having 110volt as safe.Although Nikola Tesla suggeted for 220volt AC but it was rejected by people.Now European countries required high voltages for big machines during world war 2,so they started giving 220volt and is continued till date.India also has 220volt power supply for household.Japan has110 volt.Now the question is which one is safer and which one is economical.Well as far as safety is concerned 110volt is much safer than 220volt but 110volt is costlier.Because for 110volt supply the wire required should have greater area of cross section so that resistance is less.Since resistance is inversely proportional to area of cross ...

Hey guys, Hope all is well with you all.This post is for class 11th students and engineering students of civil and mechanical streams.In 11th std physics book the definition of stress is simply given as the force applied per unit area on a body.Mathematically it is all good.But as far as real definition according to mechanics is concerned it is the reacting force generated per unit area in response to the external force applied.Had it been not so you cannot define the maximum stress limit of an object.Whenever stress limit is exceeded the object attains fatigue and tends towards fracture.Meaning stress of any object is bearable response to external load.Take an example of our daily life where we say the work load in office has created much stress in my life.Here stress refers to the mental stress caused due to work pressure.Here our brain is responsing to external pressure.Both the cases are similar.So understand this anology.So for a good engineering student stress is the force acti...

Hii, Next revolution in the field of energy is renewable energy.All the major developed countries have already started implementing it.One of the major source of renewable energy is solar energy.But do you know how solar panels work?The physics behind it is divided into certain stages.Solar plates employ photovoltaic cells which convert light into electricity.As light is dual in nature meaning it has particle and wave nature.Here the particle nature comes into play.Particles are nothing but photons(small packets of energy).When the photons hit the photovoltaic cell charges flow from positive to negative terminals.This electricity is DC in nature which is converted to AC with the help of inverter consisting of capacitor.Thus electricity is provided at our household loads.The excess electricity is sent to grid which provides you electricity on cloudy days.Moreover if you can transfer more energy to grid by consuming less,the government gives you subsidy also in most countries.So I hope...

Hey, This post is for everyone.From childhood we have grown up seeing our parents giving water to plants using pipes.We all have tried our hands also in that.Now we have always heard that by reducing the pipe diameter by using our fingers blocking the outlet we can increase water pressure and water will go further distance.No doubt water will travel longer distance but in this case pressure is not increasing but velocity is.Dont get confused by the formula of pressure (F=M/A) as it is applicable for solids only.In case of liquids it will follow Bernoulli's  equation stating if area is decreased kinetic energy or velocity gradient will increase and pressure gradient will decrease.So now it should be clear to all. Thanks....

Hey Kids, This post is for standard 9th students.You must be having chapter of pressure in mechanics and as of now you must have become familiar with the terms scalar and vector.If a quantity can be defined completely using only magnitude it is scalar and if direction is also required apart from magnitude then it is vector.By the definition of pressure it is Force acting per unit area.Here what happens is that no matter where you apply the pressure,its effect will be taken by the perpendicular component of that force acting on unit area.Since here it is predefined that you should take only the perpendicular component so you don't have to worry about direction.Your books might not contain above facts as these are more precisely defined in 11th standard.For the time being just know that it is scalar as it force will be perpendicular to area.You will know about vector additions,multiplications,divisions and triangle rule in higher classes.Then it will become more clear. Thanks...

Hello friends, This one is a puzzle question.There were two bears A and B having same mass m.But weight of A being higher than B. Tell the colour of A and B. .... Confused... If two things have same mass but different weight then there must be difference in acceleration due to gravity.Now,due to oblate spheroidal shape of earth the radius of earth varies at poles and equator.The radius being smaller at poles,g will be higher since g=Gm/r2.Therefore the bear must be at North or south pole.Since polar bears are found in north pole,so the colour will be white.Hence A has white colour and B black. Thanks...

Hey guys, We all have heard about transformers and we also know that what does it do.Transformers have been created to transfer required voltage at required destination.It works on the principle of mutual induction.There are two types of transformers,one step up and other step down.Step up increases voltage and step down decreases voltage.As its use differs at different situations,so transformers are given units KVA or MVA but not in watt or kilowatt.Because transformers transfer power but they don't consume it.So it is not a load but it is a machine that supplies power to loads.The users of transformers will get to know from its unit that where they should use this according to the voltage required for the particular load.So remember transformers are not loads but they provide power to loads.The load can be house'sTv,Fridge,AC,cooler,Fan etc.Depending upon the type of loads transformers are used. Thanks...

Hii, This post is about the reason why you should turn your vehicle increasing the radius of turning during taking turns which are momentarily circular in nature.It is known to all of us how to take turns but reason behind is being explained here.What happens is that while taking circular turn if you dont increase the radius it will create higher centripetal force.F=mv2/r.Now to counter this force,the frictional force provided by the road to your wheels will increase but it cannot provide the frictional force beyond its limit.After which the vehicle will skid.Another point to be considered is that velocity should also be lower otherwise the centripetal force will increase by above formula which will also increase the frictional force required.Hence you should take slow turns by increasing radius of turning.Here centripetal force and frictional force act opposite to each other. Thanks..