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NCERT Solutions for Class 9 Science Chapter 10 Gravitation: This article aims to give you NCERT Solutions that make it easier for you to grasp the concepts in the Class 9 Gravitation chapter. Through CBSE NCERT class 9 science chapter 10 exercise solutions, you will get the necessary insights into the chapter. Have you ever noticed that when you shake a tree leaf, it falls down? When we drop a pen, it falls. A leaf & pen fall down because of gravitational force due to the earth. The solutions for NCERT Gravitation Class 9 Science Chapter 10 are going to provide you with the solutions for some important topics of the chapter such as gravitation, free fall, weight, thrust, and pressure, etc. Class 9 Science Chapter 10 exercise question answers are also available class-wise and subject-wise.
Detailed class 9th gravitation NCERT solutions are prepared by highly qualified subject matter experts of careers360. Students can download the solution in the form of PDF by visiting the link below for free. Apart from this team of Careers360 has also prepared the NCERT Notes. Students can access the NCERT Class 9th Notes Subject wise notes to prepare well in the exam which is free of cost.
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Gravitation is an important chapter in the Class 9 NCERT syllabus. In order to solve questions from the NCERT book or any other related books, it is necessary to have a solid understanding of the concepts and formulas. The experts at Careers360 have compiled the following important formulas from Chapter 10 of NCERT Class 9 Science textbook which are listed below.
where:
F is the gravitational force between two objects, G is the gravitational constant (approximately 6.67430 × 10-11 m³/(kg·s²)), m1 and m2 are the masses of the two objects, and r is the distance between the centres of the two objects.
T² = k × R³
Where:
T represents the orbital period, R represents the average distance from the Sun (also known as the semi-major axis), and k is a constant.
Students can download chapter-wise important formulas in PDF format by clicking on the link below. These formulas can be extremely helpful for quick revision during exams and tests.
Download Ebook - NCERT Class 9 Science: Chapterwise Important Formulas, Diagrams, And Points
The important topics of ncert class 9 science chapter 10 exercise solutions are listed below:
Gravitation class 9 ncert solutions - Topic 10.1 Gravitation
Q1. State the universal law of gravitation.
Answer:
The universal law of gravitation states that everybody in the universe attracts every other body by the virtue of its mass. This force is directly proportional to the product of the masses of the two bodies and inversely proportional to the square of the distance between them.
Let there be two bodies of masses m 1 and m 2 and let the distance between them be r. The gravitational force F g between them would be given by
where G is the universal gravitational constant and is equal to
Answer:
Let M E and m be the masses of the earth and the body and let the distance between the centre of Earth and the body be d. The magnitude of the gravitational force between the earth and the object would be given by the relation.
Mass of Earth,
d would be approximately equal to the radius of the earth.
Radius of Earth
Chapter 10 Science Class 9 exercise answers - 10.2 Free fall
Q1. What do you mean by free fall?
Answer:
We say an object is freely falling when it is dropped from some height and is attracted by the gravitational force of earth only and is under the influence of no other considerable force.
Q2. What do you mean by the acceleration due to gravity?
Answer:
Each object on the Earth is under the influence of the gravitational force of the earth. The acceleration due to the earth's gravitational force is known as acceleration due to gravity.
Topic 10.4 Weight
Q1. What are the differences between the mass of an object and its weight?
Answer:
The following are the differences between the mass of a body and its weight
Mass | Weight |
(i) Mass is the amount of matter contained in the body. | (i) Weight is the gravitational force experienced by the body. |
(ii) Mass of a body is always constant. | (ii) Weight of a body depends on the place where it is at. |
(iii) Mass is the measure of the inertia of the body. | (iii) Weight is the measure of the gravitational force acting on the body. |
(iv) Mass only has magnitude. | (iv) Since weight is a force it naturally has a direction associated with it as well |
(v) It's SI unit is the kilogram (kg). | (v) It's SI unit is Newton (kg m s -2 ) |
Q2. Why is the weight of an object on the moon its weight on the earth?
Answer:
The weight of an object on the moon would be given by
where M M is the mass of the moon, m is mass of the body, r M is the radius of the moon and G is the gravitational constant.
The weight of an object on the Earth would be given by
where M E and r E are the mass and radius of the earth respectively.
The above ratio is approximately equal to 1/6 and this is why the weight of an object on the moon (1/6) th of its weight on the earth .
NCERT textbook Solutions for Class 9 Science Chapter 10 Gravitation
Topic 10.5 Thrust and Pressure
Q1. Why is it difficult to hold a school bag having a strap made of a thin and strong string?
Answer:
It is difficult to hold a school bag having a strap made of a thin and strong string because as the surface area of the string in contact with the shoulders is very less and due to this, its weight applies a large pressure on the shoulders.
Q2. What do you mean by buoyancy?
Answer:
When an object is placed in a fluid it displaces a volume of liquid equal to its own volume. Due to this, the liquid exerts an upward force on the body called the Buoyant force. This tendency of a liquid to exert the upward buoyant force is called buoyancy.
Q3. Why does an object float or sink when placed on the surface of the water?
Answer:
When an object is placed on the surface of the water it displaces a certain volume of water. If the density of the object is less than that of water the buoyant force due to this displacement of water is equal to the weight of the object and it floats on the surface of the water. If the density of the object is more than the density of water, the volume of water displaced would be equal to the volume of the object itself and the buoyant force acting upwards due to this displacement of water would be less than the weight of the object and the object would sink.
Class 9 Science Chapter 10 Question Answer: Gravitation
Topic 10.6 Archimedes' Principle
Q1. You find your mass to be on a weighing machine. Is your mass more or less than ?
Answer:
The weighing scale shows the reading according to the weight applied to it. The weight on the weighing scale would be slightly less than our weight because there is a small upward force acting on us due to the buoyancy of the atmosphere and the reading would be slightly lower than our actual weight, therefore, our mass must be more than 42 kg.
Q2. You have a bag of cotton and an iron bar, each indicating a mass of when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?
Answer:
The volume of the bag of cotton would be much more than the iron bar and the upward buoyant force on the bag of cotton would be more than that acting on the iron bar and therefore the value is shown in case of the bag of cotton must be lesser than the actual value by a larger amount and therefore the bag of cotton is heavier than the iron bar.
Answer:
Let there be two bodies of masses m 1 and m 2 and let the distance between them be r. The gravitational force F between them would be given by
Let the distance between them be halved by two. The gravitational force between them would now be given by
The force of gravitation between two objects would increase by 4 times if the distance between them is halved.
Answer:
The gravitational force acting is definitely more in the case of a heavier object than a light object but the acceleration depends on the ratio of the force acting on the body to the mass of the body and since gravitational force acting on a body is proportional to its mass the acceleration due to gravity is the same for all bodies irrespective of their masses.
Q.3. What is the magnitude of the gravitational force between the earth and a object on its surface? (Mass of the earth is and radius of the . earth is )
Answer:
Mass of Earth M E is
Mass of the body m is 1 kg
The radius of the earth R E is
Universal gravitational constant, G =
The magnitude of the gravitational force between the earth and the body would be
Q4. The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?
Answer:
The earth attracts the moon with the same force as the moon attracts the earth.
We know from the third law of motion that each force has an equal and opposite force and the universal gravitational law also states the same i.e. the gravitational force of attraction between two bodies is the same.
Q5. If the moon attracts the earth, why does the earth not move towards the moon?
Answer:
The moon and the earth attract each other with the same gravitational force. It is because of the much larger mass of the earth than the mass of the moon the earth does not move towards the moon.
Q6. (i) What happens to the force between two objects, if
Answer:
As the force between the objects is directly proportional to the product of masses of the objects if the mass of one object is doubled the force between them will also double.
Q6.(ii) What happens to the force between two objects, if
The distance between the objects is doubled and tripled?
Answer:
The force between two objects is inversely proportional to the square of the distance between them. Therefore if the distance between the objects is doubled and tripled the force between them would become one fourth and one-ninth of the initial value respectively.
Q.6.(iii) What happens to the force between two objects, if
Answer:
As the force between the objects is directly proportional to the product of masses of the objects if the masses of both objects are doubled the force will become four times the initial value.
Q7. What is the importance of the universal law of gravitation?
Answer:
The importance of universal law of gravitation lies in the fact that it proves that every object in the universe is attracted by every other object in the universe by the virtue of their masses.
Q8. What is the acceleration of free fall?
Answer:
The acceleration of free fall on earth is 9.8 m s -2 and is the same for all objects i.e. its value is independent of their masses.
Q9. What do we call the gravitational force between the earth and an object?
Answer:
The gravitational force between the earth and an object is called the weight of the object.
Answer:
As the value of g is more at the poles than that at the equator the weight of the same amount of gold would be more at the poles than that at the equator and therefore the friend will not agree with the weight of gold bought.
Q11. Why will a sheet of paper fall slower than one that is crumpled into a ball?
Answer:
A sheet of paper has much more area than the same paper crumbled and due to this the sheet experiences more air resistance and thus falls at a speed slower than when it is crumbled.
Answer:
The weight of an object on earth is given by w = mg where m is the mass of the object and g is the gravitational acceleration.
g = 9.8 m s -2
Weight of a 10 kg object on earth = 10 X 9.8 = 98 N
As the gravitational force on the surface of the moon is only 1/6th of that on earth the gravitational accelerations on the moon would be equal to g/6.
Weight of an object of mass 10 kg on the moon is therefore given as follows
Q13.(i) A ball is thrown vertically upwards with a velocity of . Calculate
Answer:
The initial velocity of the ball u = 49 m s -1
Final velocity at the highest point would be v = 0
The magnitude of the acceleration is equal to the acceleration due to gravity g
Acceleration, a = -g = -9.8 m s -2
Let the maximum height to which it rises be s
Using the third equation of motion we have
The ball would rise to a maximum value of 112.5 m.
Q13.(ii) A ball is thrown vertically upwards with a velocity of . Calculate
Answer:
Let the time taken by the ball to reach the highest point be t
At the same time, t would be taken to come back to the ground from the highest point.
Therefore the total time it takes to return to the surface of the earth = 2t = 10 s.
Answer:
Initial velocity u = 0
Acceleration, a = g = 9.8 m s -2
Distance travelled, s = 19.6 m
Let the final velocity be v
According to the third equation of motion
Its final velocity just before touching the ground will be 19.6 m s -1 .
Answer:
Initial velocity u = 40 m s -1
Acceleration a = -g = -10 m s -2
Final velocity at the highest point would be v = 0
Let the maximum height reached be s
As per the third equation of motion
The net displacement would be zero as the stone will return to the point from where it was thrown.
The total distance covered by the stone = 2s = 160 m
Answer:
Mass of the earth, M E
Mass of the Sun, M S
Distance between the earth and the sun,
Universal gravitational constant,
The force of gravitation between the earth and the Sun would be given as
Answer:
Let the distance travelled by the stone which is dropped from the top upto the instant when the two stones meet be x
Initial velocity u = 0
Acceleration a = g = 9.8 m s -2
Using the second equation of motion
The distance travelled by the stone which is projected vertically upwards from the ground up to the instant when the two stones meet would be equal to 100 - x
Initial velocity = 25 m s -1
Acceleration a = -g = -9.8 m s -2
Using the second equation of motion
Equating x from (i) and (ii) we get
4.9t 2 = 4.9t 2 - 25t + 100
25t = 100
t = 4s
x = 4.9t 2
x = 4.9 X 4 2
x = 78.4 m
100 - x = 100 - 78.4 = 21.6 m
The stones meet after a time of 4 seconds at a height of 21.6 meters from the ground.
Q18. A ball thrown up vertically returns to the thrower after 6 s. Find
(a) the velocity with which it was thrown up,
(b) the maximum height it reaches, and
(c) its position after 4 s.
Answer:
(a) Let the ball be thrown with initial velocity u
Time taken to get back to the thrower = 6 s
Time taken to reach the highest point is t = 6/2 = 3 s
Final velocity at the highest point is v = 0
Acceleration a = -g = -9.8 m s -2
Using the first equation of motion
(b) Let the maximum height it reaches be s
Using the second equation of motion
(c) Out of the 4 seconds, 3 have been spent in reaching the highest point
The distance travelled by the ball in the next 1 second is s' given by
Distance from the ground after 4 seconds = s - s' = 44.1 - 4.9 = 39.2 m
The position of the ball after 4 seconds is 39.2 m from the ground.
Q19. In what direction does the buoyant force on an object immersed in a liquid act?
Answer:
The buoyant force acts on an object in the vertically upward direction opposite to that of gravitational force.
Q20. Why does a block of plastic released under water come up to the surface of water?
Answer:
The density of plastic is less than that of water and due to which the upwards acting buoyant force is more than the downwards acting gravitational force. Due to this, a block of plastic released under water comes up to the surface of the water.
Answer:
Mass of the given amount of substance = 50 g
Volume of the given amount of substance = 20 cm 3
Density of the given substance is
As the given substance has a higher density than that of water it will be sinking in water.
Answer:
Mass of the packet = 500 g
Volume of the packet = 350 cm 3
Density of the packet is given by
As the density of the packet is less than that of water it will sink in water.
Volume of the water displaced by the packet = volume of the packet = 350 cm 3
Mass of the water displaced by the packet = Volume of the water displaced by the packet X Density of water
= 350 X 1
= 350 g
Mass of water displaced is less than the mass of packet, so the packet will sink.
Topics for class 9 science chapter 10 question answer are listed below:
10.1 Gravitation
10.1.1 Universal Law of Gravitation
10.1.2 Importance of The Universal Law of Gravitation
10.2 Free Fall
10.2.1 To Calculate The Value Of g
10.2.2 Motion of Objects Under the Influence of Gravitational Force of the Earth
10.3 Mass
10.4 Weight
10.4.1 Weight of an Object on the Moon
10.5 Thrust and Pressure
10.5.1 Pressure in Fluids
10.5.2 BUOYANCY
10.5.3 Why Objects Float Or Sink When Placed on The Surface of Water?
10.6 Archimedes’ Principle
10.7 Relative Density
Where G is called universal gravitational constant whose value is
Where M is the mass of the earth and d is the distance between the object and the earth. If the object is on the surface of earth or near to earth then the radius of the earth is approximately = distance between the object and the earth. Therefore
Where R is the radius of the earth.
Also Check -
NCERT Books and NCERT Syllabus here:
Chapter No. | Chapter Name |
Chapter 1 | Matter in Our Surroundings |
Chapter 2 | Is Matter Around Us Pure |
Chapter 3 | Atoms and Molecules |
Chapter 4 | Structure of The Atom |
Chapter 5 | The Fundamental Unit of Life |
Chapter 6 | Tissues |
Chapter 7 | Diversity in Living Organisms |
Chapter 8 | Motion |
Chapter 9 | Force and Laws of Motion |
Chapter 10 | Gravitation |
Chapter 11 | Work and Energy |
Chapter 12 | Sound |
Chapter 13 | Why Do We Fall ill? |
Chapter 14 | Natural Resources |
Chapter 15 | Improvement in Food Resources |
Chapter No. | Chapter Name |
Chapter 1 | Chapter 1 Matter in our Surroundings |
Chapter 2 | Chapter 2 Is Matter Around Us Pure? |
Chapter 3 | Chapter 3 Atoms and Molecules |
Chapter 4 | Chapter 4 Structure of the Atom |
Chapter 5 | Chapter 5 The Fundamental Unit of Life |
Chapter 6 | Chapter 6 Tissues |
Chapter 7 | Chapter 7 Diversity in Living Organisms |
Chapter 8 | Chapter 8 Motion |
Chapter 9 | Chapter 9 Forces and Laws of Motion |
Chapter 10 | Chapter 10 Gravitation |
Chapter 11 | Chapter 11 Work and Energy |
Chapter 12 | Chapter 12 Sound |
Chapter 13 | Chapter 13 Why do We Fall ill? |
Chapter 14 | Chapter 14 Natural Resources |
Chapter 15 | Chapter 15 Improvement in Food Resources |
Mass of an object is a measure of inertia. It is the measure of the amount of matter in a body and is constant everywhere. But weight is the force due to gravity. If m is the mass of the object and g is the acceleration due to gravity then weight w=mg. Weight varies according to the distance since g is dependent on distance. The weight of an object in the earth is different from the weight of the same object in the moon since the value of g is different in the moon and Earth. But the mass of the object will be the same in the moon and earth.
The important topics covered in Gravitation chapter of NCERT book for Class 9 Science are-
The SI unit of gravitation is also Newtons (N).
The value of acceleration due to gravity (g) on the Earth's surface is approximately 9.8 m/s². However, it can vary slightly depending on the location and altitude. For example, it is slightly less at the equator and slightly more at the poles.
The formula for the gravitational force between two objects is given by:
F = G * (m1 * m2) / r^2
The Class 9 Science chapter on Gravitation, with its question-and-answer format, establishes a fundamental understanding of gravity that proves beneficial for higher-level studies in physics and related disciplines.
Exam Date:28 April,2024 - 28 April,2024
Exam Date:28 April,2024 - 28 April,2024
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Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.
Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.
The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.
A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.
An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.
They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.
A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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