Скачать или смотреть Class 9 Physics Chapter 10 | Mass and Weight - Gravitation

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✅ In this video,

✔️ Class: 9th
✔️ Subject: Physics
✔️ Chapter: Gravitation (Chapter 10)
✔️ Topic Name: Mass and Weight
✔️ Topics Covered in This Video: Chapter 10 Gravitation - Mass and Weight
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00:00 Introduction
00:19 Mass & Weight: Mass
07:00 Mass & Weight: Weight
18:37 Website Overview
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Mass and Weight
Mass
Mass of a body is the quantity of matter (or material) contained in it.
It is a scalar quantity which has only magnitude but no direction.
SI unit is kg.
The mass of a body is constant and does not change from place to place.
The mass of a body cannot be zero.

Weight
The weight of a body is the force with which it is attracted towards the centre of the earth.
F = GMm

By Newton’s second law of motion,
Force = mass x acceleration
Force = m x g
By definition, weight = m x g

S.I. unit of weight is Newton (N).
Weight is a vector quantity.
The weight of a body acts in vertically downward direction.
Weight depends on g therefore, weight of a body is not constant. .

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