Gravitation is one of the most interesting topics in the physics curriculum of Class 9. It helps students understand why objects fall toward the Earth and how planets move around the Sun. Moreover, this concept explains the forces that act between objects in nature and how these forces influence motion. Therefore, learning gravitation allows students to better understand many natural phenomena in our universe.

In this guide, students will learn about gravitation class 9, including the universal law of gravitation, its formula, and other important concepts explained in a simple and easy way. 

What is Gravitation? 

Gravitation is the force by which objects attract each other. Every object in the universe exerts a gravitational force on other objects. 

The most common example of gravitation is the Earth attracting other objects towards itself, which causes the falling of objects when dropped. 

For example: 

A fruit falls from a tree to the ground 

Rain falls from clouds to Earth 

Planets revolve around the sun 

All these events occur because of gravitational force. 

 

Universal Law of Gravitation Class 9 

The Universal Law of Gravitation was discovered by the scientist Isaac Newton. According to this law, every object in the universe attracts every other object with a force. 

The gravitational force depends on two factors: 

The mass of the objects 

The distance between the objects 

The formula of gravitational force is: 

F = G (m1 × m2) / r² 

Where: 

F = gravitational force 

G = gravitational constant 

m1 and m2 = masses of two objects 

r = distance between their centers 

This law explains many natural phenomena such as the motion of planets and the falling of objects on Earth. 

 

Why Objects Fall Toward the Earth 

The Earth has a very large mass compared to most objects around us. Because of this large mass, the gravitational force exerted by the Earth is strong. 

When we drop an object, the Earth pulls it towards its center due to gravitational attraction. This force is what we commonly call gravity. 

Gravity keeps: 

Humans on the surface of the Earth 

Oceans in place 

Planets in orbit around the sun 

Without gravity, life on Earth would not be possible. 

 

Importance of Studying Gravitation 

The concept of gravitation is important because it helps students understand how forces act in the universe. 

It is also used in many fields such as: 

Space science 

Astronomy 

Satellite technology 

Engineering 

For students preparing for higher studies in physics or engineering, understanding gravitation is very important. 

 

Tips to Understand Gravitation Easily 

Students can understand the gravitation chapter better by following these tips: 

Focus on understanding the basic concept first 

Practice numerical problems regularly 

Learn the gravitational formula properly 

Study diagrams and examples carefully 

Solve previous exam questions 

Regular practice helps students remember formulas and apply them confidently in exams. 

 

Frequently Asked Questions (FAQs) 

What is gravitation in Class 9? 

Gravitation is the force by which objects attract each other. In Class 9 physics, students learn how gravitational force works and how it affects objects on Earth and in space. 

 

Who discovered the universal law of gravitation? 

The universal law of gravitation was discovered by Sir Isaac Newton when he studied how objects fall and how planets move around the sun. 

 

What is the formula of gravitation? 

The formula of gravitational force is: 

F = G (m1 × m2) / r² 

This formula explains how the force between two objects depends on their masses and the distance between them. 

 

Why is gravitation important? 

Gravitation helps explain many natural phenomena such as falling objects, planetary motion, tides in oceans, and satellite movement. 

 

What is the difference between gravity and gravitation? 

Gravitation is the force of attraction between any two objects in the universe, while gravity specifically refers to the gravitational force exerted by the Earth. 

Learn Physics Easily with Tutoroot 

Physics concepts like gravitation can sometimes be difficult for students to understand without proper guidance. Learning with experienced tutors helps students understand concepts clearly and solve problems step by step. 

Tutoroot offers personalized online tutoring sessions where students can learn subjects like physics, mathematics, and chemistry from expert tutors. Interactive learning methods and one-to-one guidance help students build confidence and improve their academic performance. 

With the right support and practice, students can master difficult topics and achieve better results in their exams.