Class 9 Exam > Class 9 Videos > Science Class 9 > Gravitation
Gravitation Video Lecture | Science Class 9
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FAQs on Gravitation Video Lecture - Science Class 9
| 1. What is gravitation and how does it work? |  |
| 2. How does gravity affect the movement of planets? | |
Ans.Gravity plays a crucial role in the movement of planets. The gravitational pull of a star, like the Sun, keeps the planets in orbit around it. The balance between the gravitational pull of the star and the inertia of the planet moving forward creates stable orbits. This means that planets will continue to revolve around their star in predictable paths unless acted upon by another force.
| 3. What is the difference between mass and weight in the context of gravitation? | |
Ans.Mass is a measure of the amount of matter in an object and remains constant regardless of location. Weight, on the other hand, is the force exerted by gravity on that mass. Weight can change depending on the gravitational pull of the body you are near, such as the Earth or the Moon. For example, an object will weigh less on the Moon than on Earth due to the Moon's weaker gravitational force.
| 4. How does gravity influence ocean tides? | |
Ans.Ocean tides are primarily influenced by the gravitational pull of the Moon and, to a lesser extent, the Sun. As the Moon orbits the Earth, its gravitational force pulls water towards it, creating a bulge or high tide in the ocean. On the opposite side of the Earth, another high tide occurs due to the centrifugal force caused by the Earth-Moon system's rotation. This results in a regular pattern of high and low tides.
| 5. What are gravitational waves and why are they important? | |
Ans.Gravitational waves are ripples in spacetime caused by the acceleration of massive objects, such as merging black holes or neutron stars. They were predicted by Albert Einstein's theory of general relativity and were first detected in 2015. Gravitational waves are important because they provide a new way to observe and understand the universe, offering insights into events that are not detectable through traditional electromagnetic means (like light).
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Video Description: Gravitation for Class 9 2025 is part of Science Class 9 preparation.
The notes and questions for Gravitation have been prepared according to the Class 9 exam syllabus.
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Video Lecture & Questions for Gravitation Video Lecture | Science Class 9 - Class 9 full syllabus preparation | Free video for Class 9 exam to prepare for Science Class 9.
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