NEET PHYSICS- A BLOG FOR BETTER PRACTICE

     KINETIC THEORY OF GASES brief summary Bernoulli's Picture: Daniel Bernoulli, in 1738, was the primary to know atmospheric pressure from a molecular point of view. He drew an image of a vertical cylinder, closed at rock bottom , with a piston at the highest , the piston having a weight thereon , both piston and weight being supported by the atmospheric pressure inside the cylinder. He described what went on inside the cylinder as follows: “let the cavity contain very minute corpuscles, which are driven hither and thither with a really rapid motion; in order that these corpuscles, once they strike against the piston and sustain it by their repeated impacts, form an elastic fluid which can expand of itself if the load is removed or diminished…” Sad to report, his insight, although essentially correct, wasn't widely accepted. Most scientists believed that the molecules during a gas stayed more or less in situ , repelling one another from a distance, held somehow wi...

                 THERMO DYNAMICS brief summary Thermodynamics is that the field of physics that deals with the connection between heat and other properties (such as pressure, density, temperature, etc.) during a substance. Specifically, thermodynamics focuses largely on how a heat transfer is said to varied energy changes within a physical system undergoing a thermodynamic process. Such processes usually end in work being done by the system and are guided by the laws of thermodynamics. Basic Concepts of warmth Transfer Broadly speaking, the warmth of a cloth is known as a representation of the energy contained within the particles of that material. this is often referred to as the kinetic theory of gases of gases, though the concept applies in varying degrees to solids and liquids also . the warmth from the motion of those particles can transfer into nearby particles, and thus into other parts of the fabric or other materials, through ...

PROPERTIES OF SOLIDS AND LIQUIDS brief summary Liquids and solids differ from gases therein the particles (atoms, molecules, or ions) are much closer together, therefore the total volume of a liquid or solid is far closer to the sum of the volumes of the particles. the quantity of a gas, as you'll recall from the chapter on “The Behavior of Gases,” is said to the quantity of the spaces between the particles and to not the quantity of the particles. At all temperatures above temperature , atoms and molecules are in constant random motion. The particles travel during a line unless they hit another particle. within the absence of any attractive forces, this molecular motion would cause all substances to be in gaseous form. the very fact that solid and liquid states exist tells us that there are forces that hold molecules and atoms together even once they aren't chemically bonded. The forces of attraction that hold atoms and molecules together in solid and liquid phases are c...

                        GRAVITATION   Brief summary Gravity, also called gravitation, in mechanics, the universal force of attraction acting between all matter. it's far and away the weakest known force in nature and thus plays no role in determining the interior properties of everyday matter. On the opposite hand, through its long reach and universal action, it controls the trajectories of bodies within the system and elsewhere within the universe and therefore the structures and evolution of stars, galaxies, and therefore the whole cosmos. On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth’s mass exerts on them. Gravity is measured by the acceleration that it gives to freely falling objects. At Earth’s surface the acceleration of gravity is about 9.8 metres (32 feet) per second per second. Thus, for each second an object is in free fall, its speed increases by a...

            ROTATIONAL MOTION Brief summary: Rotational motion  is more complicated than linear motion, and only the motion of rigid bodies will be considered here. A  rigid body  is an object with a mass that holds a rigid shape, such as a phonograph turntable, in contrast to the sun, which is a ball of gas. Many of the equations for the mechanics of rotating objects are similar to the motion equations for linear motion. Angular velocity and angular acceleration The  angular displacement  of a rotating wheel is the angle between the radius at the beginning and the end of a given time interval. The SI units are radians. The average  angular velocity and is measured in radians/second/second or rad/s  2 . Consider a wheel rolling without slipping in a straight line. The forward displacement of the wheel is equal to the linear displacement of a point fixed on the rim.  d  =  S  =  r θ In t...

          WORK, ENERGY AND POWER Work Work should be possible when a force creates a displacement. For example at the point when an individual ascensions the steps of an office or a house, work is supposed to be done as he is moving against the power of gravity. Essentially, Work done by a force relies on two variables: (I) Magnitude of the force (ii) Distance through which the body moves toward force. Accordingly, Work is estimated by the result of force and uprooting of the body along the bearing of force. It is a scalar quantity and its SI unit is joule. Work = Force X Distance (S) moved toward force Or on the other hand Work = F X S - If a body gets moved or displaced by S when a force F follows up on it, at that point Work W = F S Cos θ Where θ = angle between force and displacement Note: The condition for a force to take care of job is that it should create movement in an item, for example on the off chance that the distanc...