CBSE Class 11th Universal law of gravitation Details & Preparations Downloads
In the vast expanse of the cosmos, where celestial bodies dance through the cosmic ballet, there exists an unseen force that binds them in a universal embrace. This force, articulated by the genius of Sir Isaac Newton, is none other than the Universal Law of Gravitation—a principle that governs the motion of planets, stars, and galaxies. In this exploration, we delve into the intricacies of Newton's revolutionary concept and its profound implications for our understanding of the cosmos.
Unveiling the Mysteries of the Cosmos: Exploring the Universal Law of Gravitation
In the 17th century, Isaac Newton revolutionised our comprehension of the physical world. His keen observations and groundbreaking synthesis of ideas culminated in the formulation of the Universal Law of Gravitation.
What is the Universal Law of Gravitation?
The Universal Law of Gravitation, formulated by Sir Isaac Newton in the 17th century, describes the force of gravity between two objects with mass. It is a fundamental principle in classical physics that provides a framework for understanding the gravitational interactions that govern the motion of celestial bodies. The law is expressed mathematically as:
Key points about the Universal Law of Gravitation:
Inverse Square Law: The force of gravity is inversely proportional to the square of the distance between the centres of the two masses. As the distance increases, the force decreases, and vice versa.
Proportional to Mass: The force is directly proportional to the product of the masses of the two objects. Larger masses result in a stronger gravitational force.
Mutual Attraction: The force acts on both masses equally and in opposite directions. It is a mutual interaction between the masses.
Foundation of Celestial Mechanics: Newton's law of gravitation was revolutionary because it not only explained the falling of objects on Earth but also provided a unified explanation for the motion of celestial bodies in space.
Consistency with Kepler's Laws: Newton's law of gravitation was able to derive Kepler's laws of planetary motion, providing a theoretical underpinning for the empirical observations made by Johannes Kepler.
Weight and the Gravitational Force :
Weight and gravitational force are related concepts, and understanding their connection is fundamental to grasping the effects of gravity on objects. Here's an explanation of each term and their relationship:
1. Weight:
Weight is the force exerted on an object due to gravity. It is a measure of the gravitational force acting on an object with mass. The weight (W) of an object can be calculated using the equation:
W=m⋅g
Where:
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W is the weight, m is the mass of the object, and g is the acceleration due to gravity.
The standard acceleration due to gravity on Earth's surface is approximately 9.8 m/s2. Therefore, the weight of an object on Earth is roughly 9.8 times its mass.
2. Gravitational Force:
Gravitational force is the force of attraction between two objects with mass. Sir Isaac Newton's Universal Law of Gravitation describes this force:
Universality of Gravity:
The universality of gravity refers to the idea that gravity is a fundamental force of nature that acts universally on all objects with mass, regardless of their composition or other properties. This concept is a cornerstone of our understanding of gravity and plays a crucial role in both classical and modern physics. Here are key aspects of the universality of gravity:
Mass as the Source of Gravity:
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According to Newton's Universal Law of Gravitation, every mass in the universe attracts every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
Equal Treatment of Masses:
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The universality of gravity implies that all masses, regardless of their size, shape, or composition, are subject to the same gravitational laws. Whether it's a small object on Earth or a massive celestial body in space, gravity acts universally.
Mutual Attraction:
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Gravity is a mutual force of attraction. If object A exerts a gravitational force on object B, then object B simultaneously exerts an equal and opposite force on object A. This adherence to Newton's third law of motion reflects the universality of gravitational interactions.
Application Beyond Earth:
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Gravity is not unique to Earth; it extends throughout the universe. The same principles that govern objects falling on Earth also apply to the motion of planets, stars, galaxies, and even clusters of galaxies. The universality of gravity allows for a unified understanding of celestial mechanics.
Gravitational Constant:
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The inclusion of the gravitational constant (G) in the Universal Law of Gravitation makes the force of gravity universally consistent. The gravitational constant is a fundamental constant of nature, ensuring that the law applies universally and provides a reliable framework for understanding the dynamics of the cosmos.
CBSE Class 11th Downloadable Resources:
1. CBSE Class 11th Topic Wise Summary | View Page / Download |
2. CBSE Class 11th NCERT Books | View Page / Download |
3. CBSE Class 11th NCERT Solutions | View Page / Download |
4. CBSE Class 11th Exemplar | View Page / Download |
5. CBSE Class 11th Sample Papers | View Page / Download |
6. CBSE Class 11th Question Bank | View Page / Download |
7. CBSE Class 11th Topic Wise Revision Notes | View Page / Download |
8. CBSE Class 11th Last Minutes Preparation Resources | View Page / Download |
9. CBSE Class 11th Best Reference Books | View Page / Download |
10. CBSE Class 11th Formula Booklet | View Page / Download |
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