Class 9 Exam > Class 9 Videos > Science Class 9 > Quick Revision: Gravitation
Quick Revision: Gravitation Video Lecture | Science Class 9
FAQs on Quick Revision: Gravitation Video Lecture - Science Class 9
| 1. What is the law of universal gravitation? |  |
Ans.The law of universal gravitation states that every mass attracts every other mass in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This can be expressed mathematically as \( F = G \frac{m_1 m_2}{r^2} \), where \( F \) is the gravitational force, \( G \) is the gravitational constant, \( m_1 \) and \( m_2 \) are the masses, and \( r \) is the distance between their centers.
| 2. How does gravity affect the motion of planets? | |
Ans.Gravity is the force that keeps planets in orbit around stars, such as the Earth around the Sun. The gravitational attraction between the Sun and the planets provides the necessary centripetal force that keeps the planets in their elliptical orbits, as described by Kepler's laws of planetary motion.
| 3. What is the difference between weight and mass in the context of gravity? | |
Ans.Mass is a measure of the amount of matter in an object, typically measured in kilograms (kg), and does not change regardless of location. Weight, on the other hand, is the force experienced by an object due to gravity and is calculated as the product of mass and gravitational acceleration (Weight = Mass × Gravity). Weight can vary depending on where you are, as gravitational acceleration differs slightly across locations.
| 4. What role does the gravitational constant (G) play in gravitation? | |
Ans.The gravitational constant (G) is a key value in the law of universal gravitation, representing the strength of the gravitational force between two masses. Its value is approximately \( 6.674 \times 10^{-11} \, \text{N m}^2/\text{kg}^2 \). It allows us to calculate the gravitational force between two objects based on their masses and the distance between them.
| 5. How does gravity influence tides on Earth? | |
Ans.Gravity plays a crucial role in the formation of tides on Earth. The gravitational pull of the Moon and the Sun affects the Earth's oceans, causing them to bulge outwards in the direction of these celestial bodies. This results in high tides in the areas facing the Moon and the Sun, while low tides occur in the areas perpendicular to these. The interaction of gravitational forces and the rotation of the Earth creates the regular cycle of tides.
About this Video
3.5K Views
4.85/5
Rating
Oct 02, 2025
Last updated
Related Exams
Video Description: Quick Revision: Gravitation for Class 9 2025 is part of Science Class 9 preparation.
The notes and questions for Quick Revision: Gravitation have been prepared according to the Class 9 exam syllabus.
Information about Quick Revision: Gravitation covers all important topics for Class 9 2025 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Quick Revision: Gravitation.
Introduction of Quick Revision: Gravitation in English is available as part of our Science Class 9 for Class 9 & Quick Revision: Gravitation in
Hindi for Science Class 9 course. Download more important topics related with notes, lectures and mock test series for
Class 9 Exam by signing up for free.
Description
Video Lecture & Questions for Quick Revision: Gravitation Video Lecture | Science Class 9 - Class 9 full syllabus preparation | Free video for Class 9 exam to prepare for Science Class 9.
Information about Quick Revision: Gravitation
Here you can find the meaning of Quick Revision: Gravitation defined & explained in the simplest way possible.
Besides explaining types of Quick Revision: Gravitation theory, EduRev gives you an ample number of questions to practice Quick Revision: Gravitation tests,
examples and also practice Class 9 tests.
Related Searches
shortcuts and tricks
,Previous Year Questions with Solutions
,ppt
,Semester Notes
,past year papers
,Quick Revision: Gravitation Video Lecture | Science Class 9
,Exam
,Extra Questions
,Quick Revision: Gravitation Video Lecture | Science Class 9
,Viva Questions
,practice quizzes
,Important questions
,Sample Paper
,mock tests for examination
,study material
,MCQs
,Objective type Questions
,Free
,video lectures
,Summary
,Quick Revision: Gravitation Video Lecture | Science Class 9
;
Study Quick Revision: Gravitation on the App
Students of Class 9 can study Quick Revision: Gravitation alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Quick Revision: Gravitation,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Quick Revision: Gravitation is prepared as per the latest Class 9 syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up
within 7 days!
within 7 days!
Takes less than 10 seconds to signup