• Written By Abhishek_verma
  • Last Modified 12-10-2022

NCERT Solutions for Class 9 Science Chapter 10 Gravitation

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NCERT Solutions for Class 9 Science Chapter 10 Gravitation: NCERT Class 9 Science Chapter 10 is all about Gravitation. Students study the universal laws governing Gravitation, go through detailed explanations and learn various formulas. This chapter also teaches the essential concepts of velocity, acceleration, force, work, and energy.

To help students with their exam preparations, we have provided NCERT Solutions for 9th Science Chapter 10. The solutions have been prepared by Embibe’s subject experts in accordance with the latest curriculum and guidelines. They help students get an in-depth conceptual understanding of the in-text questions. Students can also practice over 3300 questions from 82 different books on Embibe for free to strengthen their preparations. Continue reading to get the NCERT Solutions Class 9 Science Chapter 10.

NCERT Solutions for Class 9 Science Chapter 10: Important Topics

In this chapter, students learn about Gravitation and the Universal Law of Gravitation, along with the Gravitation force and its importance. Later, the concepts of free fall, the value of g, and the motion of objects under the influence of the earth’s gravitational force are also discussed. Students will also get to know the differences between mass and weight and how to calculate an object’s weight on the Moon. This chapter consists of many numerical problems that must be understood and practised diligently.

Before getting into the details of NCERT Solutions for Class 9 Science Chapter 10, let us have a look at the topics included in this chapter:

Exercise No.Important Topics
10.1Introduction to Gravitation
10.2Free Fall
10.3Mass
10.4Weight
10.5Thrust and Pressure
10.6Archimedes’ Principle
10.7Relative Density

NCERT Solutions for Class 9 Science Chapter 10: Points to Remember

We have provided some important points from NCERT Class 9 Science Chapter 10 Gravitation that students must remember. Students can refer to the points below:

  • Every object in this universe attracts other objects with some force, which depends on the masses of the objects and the distance between them. This force is called the force of gravitation.
  • Newton’s Universal Law of Gravitation states that everybody in this universe attracts every other body with force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. It can be formulated as F = Gm1m2/d2
  • Gravitational Constant (G) is equal to the force of attraction between two unit point masses, when they are separated by a unit distance, as measured from their centres. Its value in SI units is 6.67 × 10−11 N m2 kg−2.
  • Force of gravity is a special case of the force of gravitation when one among the two bodies has an infinitely large mass as compared to the other body.
  • The phenomena like (a) the motion of the moon around the earth, (b) the motion of planets around the Sun and the occurrence of high tide and low tide can be explained by the law of gravitation.

Students can access all important points for NCERT Class 9 Science Chapter 10 Gravitation on Embibe for free.

NCERT Solutions for Class 9 Science: All Chapters

Students can download the NCERT Solutions for Class 9 Science from the following:

FAQs on NCERT Solutions for Class 9 Science Chapter 10

Q.1: What is the universal law of gravitation?

Ans: The universal law of gravitation states that every object in the universe attracts every other object with force called gravitation
nal force. The force acting between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

Q.2: What do you mean by acceleration Q due to gravity?

Ans: When an object falls freely from a certain height towards the earth’s surface, its velocity changes. This velocity change produces acceleration in the object, known as acceleration due to gravity, represented by the letter g.
The gravity-based acceleration value is,
g=9.8ms-2

Q.3: Why is the weight of an object on the moon 1/6th its weight on the earth?

Ans: The moon’s mass is 1/100 times and 1/4 times the earth’s radius. As a result, when compared to earth, the gravitational attraction on the moon is about one-sixth. Thus, an object’s weight on the moon is 1/6th its earth weight.

Q.4: What do you mean by buoyancy?

Ans: The upward force possessed by a liquid on an object that’s immersed in it is referred to as buoyancy.

Q.5: You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than the other. Can you say which one is heavier and why?

Ans: The bag of cotton is heavier than the bar of iron. The cotton bag has a larger air thrust than the iron bar. The weighing machine, therefore, indicates a smaller cotton bag weight than its actual weight.

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