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 Dark Energy and Dark Matter Since our universe, or we can say earth, sun and other stars are mainly composed of tiny subatomic particles called electrons, protons and neutrons and other particles as well thus named as Baryonic matter. They are jumbled together and make the whole universe.  They make up almost 5% of the universe, then what about remaining 95% of the universe? What comes in this 95%? In the near 20th century, it was found that about 25% of the universe the composed of an invisible substance called Dark Matter, and the force that repel gravity is known as Dark Energy which constitute about 70% of the universe. This dark matter does not interact with baryonic matter (matter that makes up stars and other celestial bodies that reflect light.) and thus it does not reflect the light and therefore, scientists are unable to see the dark matter with present instruments. Various scientists say that it exerts a gravitational pull on the galaxies.  According to standa...

Why Pluto is not considered a Planet? Why it is called Dwarf Planet? Have you ever wondered how many planets there are in our solar system? What a planet is? What is the basic definition of a planet? How one can say or decide whether an object is a planet or not?  Major question that can be or usually asked is “Why Pluto is not a planet? Why it is called a Dwarf Planet? What is a Dwarf planet? How much Dwarf Planets are there in our Solar system?” Well after reading this article, you people are going to become aware of everything you need to know about a planet.  So before moving toward the question let’s learn what a planet is?  A Planet is an astronomical body that orbits around the sun. They should be large enough to be made rounded by their gravitational orbit around the sun.  In 1930 Pluto was discovered by an American astronomer named as Clyde Tombaugh and was 9th planet after Neptune in our solar system till 2006. After 2006 the definition of the planet change...

 What if Sun get Disappear Suddenly? In our Solar System, Sun play a crucial role. It is because of Sun, we are surviving actually. Since is the center of gravity for  whole solar system. All the planets are orbiting around the sun including our dear earth.  It is because of that sun we are getting enough sunlight and we are able to live in different seasons and it is because of earth being in the orbit of the sun seasons are getting change. Then we came across the hilarious question that is, " What if Sun gets disappeared? and What effect will it cause to earth?  " We if this happened everything well get destroyed!!! Isn't is odd and hilarious? Well as stated above, sun is the main center of gravity for whole solar system. If sun gets disappeared suddenly, the gravitation effect of the sun would disseminate at the speed of light. This implies that it would require approximately 8 minutes and 20 seconds for the alternation in the sun's gravitational field to rea...

  Principle of Moments Considering above figure, lets discuss what is principle of moments. The torque or moment of force produced as spanner is subjected to force as shown above in figure part a. The rotation produced will be in Clockwise direction . The torque or moment of force produced as spanner is subjected to force as shown above in figure part b. The rotation produced will be in  Anticlockwise direction . Statement: "A body is balanced if the sum of clockwise moments acting on the body is equal to the sum of anticlockwise moments acting on the body." Sum of clockwise moments = Sum of anticlockwise moments Example: A meter rod is supported at its middle point O as shown in figure 4.15 (refer book). The block of 10N is suspended at point B, 40cm from O . Find the weight of the block that balances it at point A, 25 cm from O. Data: w1= ? w2=10N Moment of arm of w1=OA=25cm or 0.25m Moment of arm of w2=OB= 40cm or 0.40m Solution: According to the Principle of the moments w...

 Centripetal Force A force that compels a body to move in the circular path is termed as Centripetal Force.  It is denoted by Fc. Derivation: Centripetal Force is directly proportional to the mass of the moving body. Centripetal force is directly proportional to the square of the velocity. Centripetal force is inversly proportional to the  radius of the circular path. Centripetal Acceleration The acceleration produced due to the centripetal force is known as Centripetal Acceleration.  It is denoted by ac. Derivation:            

 DIFFERENCE BETWEEN MASS AND WEIGHT

 MOMENTUM IN TERMS OF FORCE                             (    Δp = Ft) Download PPT Lecture Download Now

 Force And Momentum Force:             Force is an agent which produce distortion in the body.          Force is a Vector Quantity. Unit of Force:                         The unit of force is newton .                         It is denoted by N. Newton: Newton is  the force required to produce 1m/s^2 acceleration in boy of mass 1kg. Momentum:                         The momentum is the product of mass and velocity.                         Mathematically, it can be written as,                                        p=mv p =>...

 GRAPHICAL REPRESENTATION OF MOTION An object is said to be in the state of Motion if it changes its position with respect to its surroundings. In this article, I will be explaining, "How can we represent the motion of any object graphically?" Graphical Representation deals with the representation of any thing, lets say motion in our case on graph. Here we can also observe the relationship between two quantities plotted on x and y axes respectively. DISTANCE TIME GRAPH Distance time graph tells us the relationship of distance with the time.  How an object is changing its position such as speed with respect to the time. For representation of Distance and time relationship  consider an example: Figure 1: A car covering distances at different intervals of Time Figure 2: Different distance readings covered by the car at different intervals of time For example a car is moving and covering different distances at different intervals of time see figure 1 and 2. As we can observe ...

 IMPORTANCE OF PHYSICS IN SOCITY AND LIFE In the nineteenth century, physical science was divided into five distinct disciplines such as; Physics, Chemistry, Astronomy, Geology and Meteorology. The most fundamental of these is Physics.      The rapid progress in science during the recent years has become possible due to the discoveries and inventions in the field of Physics.     The technologies are the applications of scientific principles, most of the technologies of our modern society throughout the world are related to Physics. For Example A car is made on the principle of Mechanics. A refrigerator is based on the principle of Thermodynamics. In our daily life we hardly find a device where physics is not involved. Consider pulleys which are used to lift the heavy loads. Electricity which is not only converted into light and heat but also converted in Mechanical energy through which Motors and fans are operated. Consider the means of transportation such ...

 CHAPTER 01: PHYSICAL QUANTITIES AND MEASUREMENTS Before discussing Physics and Its Branches, it is necessary to know What is Science? SCIENCE: The knowledge which is obtained through Observation and Experiments is called Science. Science is divided into two categories. 1. Physical Science 2.Biological Science Physical Science deals with the study of non-living things. In this branch we have Physics, chemistry, Mathematics etc comes. Biological Science on the other hand deals with the study of Living Things. In this category Biology, Zoology, Botany etc. comes. PHYSICS: v One of the most ancient science is Physics. v Physics is defined as; “Physics is the branch of science which observe the nature represent it mathematically and conclude with the experiment.” v It basically deals with the behavior and structure of  matter and energy that derives the matter. v Physics is the branch of natural science that studies matter, its motion, its behavior through space and ...