There is a long year ago people did not have any means of transport. They used to move only on foot and carry goods on their back.
After that there has the invention of the wheel made a great change in modes of transport. The design of the wheel was improved over thousands of years. Animals were used to pull carts that moved on wheels.
The invention of steam engine led to the development of new means of transport. Railroads were made for steam engine driven carriages and wagons.
Here we will you know whether you can walk all the way to your school or whether you will need to take a bus or a rickshaw to reach your school.
Sometimes, there are objects whose length or width we need to know.
For all these there is a standard scales were made and he has been trying to follow different methods of measuring distances.
The measurement means the comparison of an unknown quantity with some known quantity is known fixed quantity is called a unit. The result of a measurement is expressed in two parts. One part is a number. The other part is the unit of the measurement.
The length of a foot, the width of a finger, and the distance of a step were commonly used as different units of measurements.
People also used the "foot" as a unit of length in different parts of the world. The length of the foot used varied slightly from region to region. A “yard” of cloth by the distance between the end of the outstretched arm and their chin.
Each metre (m) is divided into 100 equal divisions, called centimetre (cm).
Each centimetre has ten equal divisions, called millimetre (mm). Thus,
1 m = 100 cm
1 cm = 10 mm
There has a measurement activities using a standard scale and measure in SI units.
There is using of various types of measuring devices. We use a meter scale for measuring length.
We cannot measure the length of a curved line directly by using a meter scale. We can use a thread to measure the length of a curved line.
For this we need some standard units and devices with which we measure these distances and can convey our results to others.
There are various things that has move one place to another. These may include a school bag, a mosquito, a table, people sitting on chairs or people moving about. The list may also have a butterfly, a dog, a cow, your hands, a small baby, a fish in water, a house, a factory, a piece of stone, a horse, a ball, a bat, a moving train, a sewing machine, a wall clock or the hands of a clock.
In that some of are living organisms and some of them are non-living things.
Ants are likely to be attracted to the sugar and you will find many ants crawling on the sheet of paper soon. For any one ant, try and make a small mark with a pencil near its position when it has just crawled on to the sheet of paper.
There is various type's of the motions. In such of the motion of a vehicle on a straight road, march-past of soldiers in a parade or the falling of a stone.
The motion of a point marked on the blade of an electric fan or the hands of clock are examples of circular motion.
An object repeats its motion after some time. This type of motion is called periodic motion. For example of periodic motion a branch of a tree moving to and fro, motion of a child on a swing.