CBSE Class 11 / 9 - Physics - Gravitation - Understanding Mass and Weight (#cbseNotes)

Understanding Mass and Weight

Physics - Gravitation

Mass and Weight
The quantity of matter in a body is known as mass of the body. Mass is quantitative measure of inertia. Mass is an intrinsic property of matter and does not change as an object is moved from one location to another. Weight, in contrast, is the gravitational force that earth exerts on the object and can vary, depending on how far the object is above the earth's surface or whether it is located near another body such as the moon. The relation between weight W and mass m can be written in one of two ways:

W = GMₑm / r²
W = mg

According to the Newton's second law,
Force = mass ✕ acceleration

or mass = force / acceleration

Mass is of two types :
i) Inertial mass

ii) Gravitational mass


1. Inertial Mass:
Ratio of the applied external force and the acceleration produced in the body is known as inertial mass,

m_i = External force applied / Acceleration produced.

CBSE Class 8 - History - Ch 5 - When People Rebel (Assignment) (#cbseNotes)

CBSE Class 8 - History - Ch 5 - When People Rebel (Assignment) 

CBSE Class 8 - Civics - Indian Constitution - Provisions of Constitution (#cbseNotes)

Provisions of Constitution

CBSE Class 8 - Civics - Indian Constitution

Provision	Source
Republic	French constitution
Independence of Judiciary	USA constitution
Judiciary review
President as the executive head	USA constitution
President as the supreme commander of the Armed forces	USA constitution
Vice-President as the ex-officio chairman of the Council of States	USA constitution
Fundamental rights	USA constitution
Preamble	USA constitution

CBSE Class 7/8/9/10 English Grammar - Prepositions Practice Sheet (#cbseNotes)

Prepositions Practice Sheet

Fill in the blanks with suitable preposition. In some questions options are given. 

⑴ All _______ Ram were present.

⑵ They deal _____ gems. (in/ with)

⑶ He will see me ______ a week. (after/for)

⑷ He has no taste _____ panting. (with / for)

CBSE कक्षा ९ - हिंदी (ब) - स्पर्श -२ - पाठ 2 दुःख का अधिकार (प्रश्न - उत्तर) (#cbseNotes)

पाठ 2 - दुख का अधिकार (प्रश्न - उत्तर)

लेखक: यशपाल

निम्नलिखित प्रश्नों के उत्तर एक दो पंक्तियों में दीजिए|

प्रश्न 1: किसी व्यक्ति की पोशाक को देखकर हमें क्या पता चलता है?

उत्तर: किसी व्यक्ति की पोशाक को देखकर हमें उसके अधिकार व दर्जे का पता चलता है|

प्रश्न 2: खरबूजे बेचने वाली स्त्री से कोई खरबूजे क्यों नहीं खरीद रहा था?

उत्तर: खरबूजे बेचने वाली स्त्री से कोई खरबूजे नहीं खरीद रहा था क्योंकि स्त्री का पुत्र एक दिन पहले ही मरा था और वह दुकान पर बैठी घुटनों पर मुँह छुपाए फफक-फफक कर रो रही थी|

प्रश्न 3: उस स्त्री को देखकर लेखक को कैसा लगा ?

CBSE Class 9 - Force and Laws of Motion - What is Inertia? (#cbseNotes)

What is Inertia? 

CBSE Class 9 - Force and Laws of Motion 

Let's move the rock!

Inertia
It is inherent property of all bodies, by virtue of which it resists or opposes any change to it's present state of rest or of uniform motion. It varies directly as mass of the body.

Inertia of a body is of three types:

① Inertia of rest

It is in ability of a body to change by itself or if state of rest. This means a body at rest remains at rest and cannot start moving on its own.

CBSE Class 8 - Science Periodic Test-1 (2017-18) (#cbseNotes)

CBSE Class 8 - Science Periodic Test-1 (2017-18) 

Questions asked in the Q. Paper are from the following chapters:

1. Crop Production and Management
2. Coal and Petroleum
3. Combustion and Flame
4. Universe

CBSE Class 8 - Maths Periodic Assessment-1 (2017-18) (#cbseNotes)

CBSE Class 8 - Maths Periodic Assessment-1 (2017-18) 

Questions asked in the Q. Paper are from the following chapters:

1. Rational Numbers

CBSE Class 8 - Science - Synthetic Fibres - Know Your Plastic Bottle (#cbseNotes)

Know Your Plastic Bottle

Class 8 - Science - Synthetic Fibres

Resin Coding System (Image Credits: Openclipart)

In 1988, the Plastic Industry Association developed the Resin Identification Codes (1-7), a set of symbols appearing on plastic products that identify the plastic resin out of which the product is made. This help the workers to sort out various plastic bottles in order to recyle or reuse them or not.

Here is a table of resin codes that are used to get information about the application of plastic, its safety and re-usability.

♳ PET/PETE
Polymer: Polythene Terephtalate
Common Applications: Soft Drink, Water and Salad Dressing bottles, peanut butter and jam jars.
Safe for Alimentary Use: Safe One Type Use.
Reusable: No

CBSE Class 10 - Science Periodic Assessment -1 (2017) (#cbseNotes)

CBSE Class 10 - Science Periodic Assessment-1 (2017) 

Questions asked in the Q. Paper are from the following chapters:

1. Biology : Life Processes
2. Chemistry: Chemical Reactions and Equations
3. Physics: Electricity