CHAPTER 1 || Measurements and Motion || importance of measurement || class 6th || IIT foundation

CHAPTER 1 || Measurements and Motion || importance of measurement || class 6th || IIT foundation
CHAPTER 1
Measurements and Motion
Remember
Before beginning this chapter, you should be able to:
Recall various physical quantities such as length, area, volume, mass, time, speed, etc.
Know the usage of few measuring devices used in our daily life
Key Ideas
Ager completing this chapter you should be able to:
Understand various physical quantities, units and their conversions
Describe various ways of measuring physical quantities, which are used commonly in our daily life
Differentiate rest and motion; distance and displacement, speed and velocity
Define types of motion
INTRODUCTION
the act or process of determining the size or The value of a certain quantity is measurement. A number is assigned to an attribute or characteristic of an object in this act of measuring
Importance of Measurement
Measurement is esencial for maintaining accuracy in our everyday life. It plays an essential role in our liver
Examples:
For buying milk
For buying rice, sugar, etc., from a grocery shop.
For getting a dress stitched at a tailoring shop For checking a patient's body temperature.
For finding out the speed of a vehicle
For checking the speed of an object falling on the ground.
Figure 1.1
A clinical thermometer, used to measure human body temperature
Figure 1.2
A ruler, used to measure distances
Fipare 1.3
Graduated cylinder, used to measure volume of liquids
Measurement involve assigning a number (magnitude) and a unit to the physical quantry Without the units the measurement is not complete.
Figure 1.4
A Vernier scale: usedlo measure external and internal diameters of an object
Figure 1.5
A beam balance: used to measure mass
Figure 1.4
A measuring jar, used to measure oils/kerosene
Generally, we come across many terms in our daily lives, such as length, height, tume, mass, faith, hope, affection, etc Among these, only a few can be measured. For example, mas as 2 kg, length as 5 m, and time as 3 seconds and so on. But quantities, such as faith, hope, or affection cannot be expressed in numbers but can be exprewed only as more or less. Only those quanuties which can be meatured physically are called physical quantities.