Objects around us

OBJECTS AROUND US

When we look around, we find ourselves surrounded by a number of objects. Some of these different objects are made from a number of different materials, while others are made using the same material. For Example, both desk and chair are made from wood while pen and dustbins are made using plastic. The material from which an object is made depends on its properties.

OBJECT – Object is a thing that is made up of one or more material.

Example – Pencil, chair, Table, Book, Food Item etc.

There is a vast variety of objects everywhere.

All objects around us are made up of one or more materials.

A thing can be made of different materials.

Many things can be made from the same material.

Material – Object is made up of Material.

Example – Pencil is an Object and it is made up of Materials like wood, metal, Graphite.

Classification: The process of sorting and grouping things according to some basis is called classification.

Why do we need to group objects?

We need to group objects for a number of reasons:

• Convenience to store: We often group objects in order to store similar objects together in order to make locating them easier in the future. Even in our homes, we store spices together in the kitchen while storing washing products in our bathrooms.
•  Convenience to study: We also group objects so that it becomes easy for us to study their features as well as the patterns of these features.

Basis of grouping: We can group materials on the basis of the similarities and differences in their properties. Each material has its own properties, that may differ from others. However, some properties may be common to one or more materials.

Grouping On The Basis Of Common Properties:
Objects are made of different materials. One material can be used to make different objects. This is possible because different types of materials have different properties. We have to choose materials with the right properties based on what we want to use it for. For example, a chalk made of wood or plastic would be of no use because it cannot be used to write on the blackboard.

Materials have different properties like roughness, lustre, transparency, solubility, flotation, attraction towards a magnet, conduction of heat, and conduction of electricity. Let us study these properties one by one.