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Question 72: Universal law of gravitation states that every ob
Physics by Lakhmir Singh
Physics

Class 9

Lakhmir Singh

Author:
Lakhmir Singh
Publisher:
S. Chand
Subject:
Science
1

Chapter 1: Motion

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2

Chapter 2: Force and Laws of Motion

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3

Chapter 3: Gravitation

157 questions

Q1
Question 69: An apple of mass 100 g falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be F1 and the magnitude for force exerted by the apple on the earth be F2, then :

(a) F1 is very much greater than F2
(b) F2 is very much greater than F1
(c) F1 is only a little grater than F2
(d) F1 and F2 are exactly equal
Q2
Question 72: Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?
Q3
Question 74: A coin and a piece of paper are dropped simultaneously from the same height. Which of the two will touch the ground first? What will happed if the coin and the piece of paper are dropped in vacuum? Give reasons for your answer.
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4

Chapter 4: Work and Energy

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Chapter 5: Sound

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Question 72: Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?

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Question 72: Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?
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Answer: In order to notice the gravitational force of attraction that act between two objects, it is necessary that one of the objects should have extremely large mass as compared to the other. But none of the object has such large mass, so we cannot notice the forces.
The two objects in a room do not move towards each other because they have small mass and so the gravitational force of attraction between them is very weak.
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Q1
Question 69: An apple of mass 100 g falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be F1 and the magnitude for force exerted by the apple on the earth be F2, then :

(a) F1 is very much greater than F2
(b) F2 is very much greater than F1
(c) F1 is only a little grater than F2
(d) F1 and F2 are exactly equal
Q2
Question 72: Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?
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Question 74: A coin and a piece of paper are dropped simultaneously from the same height. Which of the two will touch the ground first? What will happed if the coin and the piece of paper are dropped in vacuum? Give reasons for your answer.
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Question Text
Question 72: Universal law of gravitation states that every object exerts a gravitational force of attraction on every other object. If this is true, why don't we notice such forces? Why don't the two objects in a room move towards each other due to this force?
TopicGravitation
SubjectScience
ClassClass 9
Answer TypeText solution:1
Upvotes84