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. Acceleration formula Acceleration = Change in velocity ⁄ time Thus, … 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


Energy – Whenever we do any work, we feel tired as we expend some energy. Energy spent appears in the form of work done. Energy is defined as the ability of a body to do work. Energy has the same … Read more

Center of gravity

You must have seen a circus artist doing a tight rope walk. Ever wondered how he manages to walk on a rope without falling down and why he stretches his hands or holds a long bamboo pole while doing so? … Read more


Logarithm – Please recall that you have earlier learnt about indices. One of the results we learnt is that if 2x = 23, X=3 and if 4n = 4y then x = y, i.e., if two powers of the same … Read more