Learning Time

  Standard of Length, Mass And Time Standard: What is Standard why it is necessary to set a Standard while measuring any physical quantity? So basically before 160, different systems of units were established/introduced and almost every system of unit has different unit for the base quantities. For Example: In CGS the units for base quantities were like; Mass was measured in Grams. Length was measured in Centimeter. Time was measured in Seconds. In MKS the base quantities were measured by: Mass was measured in Kilogram. Length was measured in Meter. Time was measured in Seconds. And in FPS these base quantities were measured in: Mass was measured in Pound. Length was measured in Foot. So, there were difficulties whether which unit should be preferred for accurate measurement and therefore after 1960, International S.I stem of Units were introduced and 7 fundamental quantities were introduced with their standard Units. So, Standard is defined, " Standard in measurement is a priorit

 PHYSICAL QUANTITIES Physical Quantities are those which can be measured and have a unit are called Physical Quantities. They are classified into two types. 1. Fundamental Quantities 2. Derived Quantities 1. Fundamental Quantities Those quantities which are basic in nature and can not be derived from any other quantity are known as Fundamental Quantities. For Example: Mass, Length, Time etc. The units of fundamental quantities are called Fundamental Units. For example: We have unit of length is Meter. Here Length is fundamental Quantity and Meter is its fundamental Unit. 2. Derived Quantities: Those which quantities which are derived from other fundamental quantities are termed as Derived Units. The Units of Derived Quantities are called Derived Units. For Example: Force, Momentum, Density, Volume etc. Their units are called derived units. Before 1960, there were three systems of units they are; 1.CGS 2.MKS 3.FPS In each system there were different units of those fundamental quantities

 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 as cars, aero planes, domesti

  A VILLAGE FAIR SUMMARY OF A VILLAGE FAIR: Bilal got tired and decided to spend some days during the summer vacation with his cousin in village. When he reached there, he saw that the village was decorated with buntings and colgtful fa His cousin Zubair told him that this decoration was due to the celebrations of village fair. file was much interested in visiting the village fair so he went there and saw a number of interesting things. The temporary shops were setup there and people from far and wide had come here to buy the articles of daily needs in reasonable rates. Women were found here buying bangles and rings. They were more interested in buying household items, while the men were buying farming tools and other articles. The people, who had come from far away, were enjoying the food there. Popular music was being played there. They also saw a large crowd had gathered to see the fight between a bear that was tied to a pele and three fierce dogs. Bilal disliked this game and c