🌈 ICSE class 9 Physics, Chapter 1- Measurements and Experiments part -1

 

Measurement -

Measurement is the process of comparison of the given quantity with the known standard quantity of the same nature.

Measurement = N x U

N- numerical value

U- unit 

Unit is the quantity of a constant magnitude which is used to measure the magnitudes of other quantities of the same nature.

 PHYSICAL QUANTITY

In our day to day life, we come across so many physical quantities like distance, mass, weight, speed, etc.

Physical quantity refers that quantity that can be measured. Sometimes magnitude is sufficient to completely describe that quantity like mass- 5kg but sometimes direction also plays an role and magnitude and direction both needed to describe that physical quantity like weight of the weight- 100N (direction vertically downward)

Details 

Physical quantities as -- 1. Fundamental

                                        2. Derived

Fundamental Quantities:- Independent physical quantities are fundamental quantities.

For example:- length, mass, time etc. are independent of each other.

Derived Quantities:- Some physical quantities can be derived from other physical quantities called derived quantities 

For example:- density, area, pressure, etc.

Conversions

Units of Length

| Unit | Symbol | Equivalent Value |

| --- | --- | --- |

| kilometre | km | 1000 m |

| hectometre | hm | 100 m |

| decametre | dam | 10 m |

| metre | m | 1 m |

| decimetre | dm | 0.1 m|

| centimetre | cm | 0.01 m |

| millimetre | mm | 0.001 m |

| micrometre | μm | 0.000001 m |

| nanometre | nm | 0.000000001 m |

| Angstrom | Å | 0.00000001 m |

 

Units of Mass

| Unit | Symbol | Equivalent Value |

| --- | --- | --- |

| kilogram | kg | 1000 g |

| gectogram | hg | 100 g |

| decagram | dag | 10 g |

| gram | g | 1 gram |

| decigram | dg | 0.1 g|

| centigram | cg | 0.01 g |

| milligram | mg | 0.001 g |

| microgram | μg | 0.000001 g |

| nanogram | ng | 0.000000001 g|

 

Units of Time

| Unit | Symbol | Equivalent Value |

| --- | --- | --- |

| second | s | 1 second |

| minute | min | 60 s |

| hour | h | 3600 s |

| day | d | 86400 s|

| week | w | 604800 s |

| month | m | approximately 2629743 s |

| year | y | approximately 31557600 s |

| century | c | 100 years |

| Millennium | m | 1000 years |

Here are some links of Google Forms for you to fill up

1. Quizzo
2.  Students Corner  (Here upload your work and get featured in this blog

Student's corner:-

Abhilasha Jha, Jamshedpur

Rainbow mindmap of Vernier caliper, Screw gauge and Simple Pendulum 

Rainbow mindmap of f Simple Pendulum, video and experiment

ICSE class 9 Physics, Solutions Chapter Measurements and Experiments-1A

ICSE class 9 Physics,  Solutions 1B Chapter 1- Measurements and Experiments 

ICSE class 9 Physics,  Solutions 1C Chapter 1- Measurements and Experiments 

AUTHOR-

RITU