Gas equation

From these two laws, we understand that the pressure, volume and absolute termperature of a gas are interrelated, and a change in any one produces a chage in the other two. Consider a given mass of a gas. Let its … Read more

Impulsive force and Impulse

When a sharp knock is given to a door, the moving finger has momentum. Once the door is struck, the momentum of the finger is reduced to zero in a very short interval of time, As a result the force … Read more


Mass Mass is the amount of matter contained in a body. Mass of a body is the measure of inertia. Mass is a scalar quantity. Its unit is kg in SI system and gram in C.G.S. system. Mass of a … Read more


In dynamics we study the cause of motion of bodies and why they move fast, or slow or remain at rest. If a full or a push is given to a body which is a rest or to a body … Read more


If you have played cricket, you would have experienced that catching a ball which is moving with a higher velocity is more difficult than catching a ball which is moving with lesser velocity. Similarly, it is easier to catch a … Read more


Glass is a homogeneous supercooled liquid. Its very high viscosity gives it an appearance of a solid. Major constituents of glass are sodium silicate, calcium silicate and silica. The arrangement of the constituent particles in the glass does not follow … Read more


When we walk on sand we leave our foot prints in the sand. This is due to the weight of our body which acts normal to the surface of contact – the foot and sand. Similarly when we want to … Read more


The word ‘data’ means information in the form of numerical figures or a set of given facts. For example, the percentage of marks scored by 10 pupils of a class in a test are: 36, 80, 65, 75, 94, 48, … Read more

Equation of motion

There are three important equations of motion, that is: v = u + at s = ut + 1/2at2 V2 = u2 + 2as Here ‘u’ is the initial velocity, ‘v’ is the final velocity, ‘a’ is the uniform acceleration … Read more


A particle moving with variable velocity is said to possess acceleration. When a particle executes non-uniform motion, its velocity changes. Acceleration is defined as the rate of change of velocity. It is a vector quantity. The unit of acceleration is … Read more


Partnership – The total amount of money required to start a business is called its capital. It is not always possible for a single person to invest huge amount of money. So, two or more persons come together and start business jointly. … Read more