Because we calculate the speed in terms of distance, we do not consider the direction when we calculate the speed. Therefore, it must be clear to you by now, that the speed is a scalar quantity. The velocity however, is defined as the rate of change of the displacement. Therefore, it is a vector quantity […]
Read MoreWe frequently hear about accidents caused by vehicles moving at high speeds. Due to this reason, there are different regulatory speed limits assigned to different roadways. We should obey these speed limits in order to prevent accidents, particularly in highways with high speed limits. What we mean by speed is the rate at which a […]
Read MoreDistance and displacement Distance is a concept familiar to you. When you go from home to school, you have to travel a certain distance. Sometimes, there can be several paths you could use to travel between home and school. Some of them could be shorter and some longer. Figure 2.1 shows several paths that a […]
Read MoreWater The highest proportion of the body mass of living organisms is composed of water which is an inorganic compound. Two third (2/3rd) of the body weight of most of organisms is by water. Water is an essential medium for the maintenance of living matter. Life originated in water. Composition of water is simple. As […]
Read MoreNucleic acid is the most important molecule out of the main bio molecules in living matter in genetical aspect. It is a linear polymer made up of large number of nucleotides. It contains Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N) and Phosphorous (P). Each nucleotide is made up of 3 components. They are ; […]
Read MoreFats and oils belong to this group. Lipids which are solid at room temperature are called fats and liquids are called oils. Similar to carbohydrates, fats also contain Carbon, Hydrogen and Oxygen as constituent elements. But a lipid contains much less oxygen than a carbohydrate. Lipids are insoluble in polar solvents including water. They are […]
Read MoreProtein is an essential constituent in all living cells. Carbon(C) Hydrogen (H), Oxygen (O) and Nitrogen (N) are always present in proteins. Sometimes Sulphurcan also be present. 17% of the mature human body is composed of proteins. Protein is a complex molecule made up of polymerized amino acid molecules. Meat, fish, egg white cereals are […]
Read MoreThe bodies of all organisms are composed of variety of chemical compounds. These chemical compounds are formed by the bonding of naturally existing elements in different ways.There are only about 25 elements in the living body out of the 92 elements present in nature. They are present at different locations in the body in different […]
Read More
