Science Exemplar
Class 9
NCERT Exemplar
1
Chapter 1: Matter in Our Surroundings
22 questions
2
Chapter 2: Is Matter Around Us Pure?
37 questions
3
Chapter 3: Atoms and Molecules
46 questions
4
Chapter 4: Structure of the Atom
38 questions
5
Chapter 5: The Fundamental Unit of Life
52 questions
6
Chapter 6: Tissues
50 questions
7
Chapter 7: Diversity in Living Organisms
51 questions
8
Chapter 8: Motion
16 questions
9
Chapter 9: Force and Laws of Motion
18 questions
10
Chapter 10: Gravitation
26 questions
Q1
Question 23:
How does the weight of an object vary with respect to mass and radius of the earth. In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected?
Q2
Question 24:
How does the force of attraction between the two bodies depend upon their masses and distance between them? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with his hypothesis or not? Comment.
Q3
Question 25:
Two objects of masses m1 and m2 having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if (i) one of the objects is hollow and the other one is solid and (ii) both of them are hollow, size remaining the same in each case. Give reason.
View all question11
Chapter 11: Work and Energy
27 questions
12
Chapter 12: Sound
13 questions
13
Chapter 13: Why do We Fall Ill?
39 questions
14
Chapter 14: Natural Resourses
56 questions
15
Chapter 15: Improvement in Food Resources
48 questions
Question
Question 24: How does the force of attraction between the two bodies depend upon their masses and distance between them? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with his hypothesis or not? Comment.
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Text solution
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Answer:
Newton's law of gravitation states that the force of attraction between body is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Mathematically,
The acceleration due to gravity (g) is independent of the mass of the falling body.
Here, M is mass of earth and R is radius of earth.
Therefore, the two bricks tied together falls with the same speed as the single one.
Hence the hypothesis of the boy is not correct.
Mathematically,
The acceleration due to gravity (g) is independent of the mass of the falling body.
Here, M is mass of earth and R is radius of earth.
Therefore, the two bricks tied together falls with the same speed as the single one.
Hence the hypothesis of the boy is not correct.
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Practice more questions from Science Exemplar (NCERT Exemplar)
Q1
Question 23:
How does the weight of an object vary with respect to mass and radius of the earth. In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected?
Q2
Question 24:
How does the force of attraction between the two bodies depend upon their masses and distance between them? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with his hypothesis or not? Comment.
Q3
Question 25:
Two objects of masses m1 and m2 having the same size are dropped simultaneously from heights h1 and h2 respectively. Find out the ratio of time they would take in reaching the ground. Will this ratio remain the same if (i) one of the objects is hollow and the other one is solid and (ii) both of them are hollow, size remaining the same in each case. Give reason.
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| Question Text |
Question 24:
How does the force of attraction between the two bodies depend upon their masses and distance between them? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Do you agree with his hypothesis or not? Comment.
|
| Updated On | Aug 30, 2022 |
| Topic | Gravitation |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 Video solution: 2 |
| Upvotes | 295 |
| Avg. Video Duration | 8 min |
