NCERT Books for Class 9 | NCERT Science Book Class 9

Gravitation is an important chapter in Class 9 Science that explains the force of attraction between objects. It helps students understand why objects fall towards the Earth, why planets revolve around the Sun, and how gravity influences everyday life.

What is Gravitation?

Gravitation is the force of attraction between any two objects having mass. This force acts universally and is responsible for many natural phenomena in the universe.

Universal Law of Gravitation

The universal law of gravitation explains that every object attracts every other object with a force that depends on their masses and the distance between them.

Mass and Weight

Mass is the amount of matter present in an object and remains constant.
Weight is the force with which the Earth attracts an object and can vary from place to place.

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Free Fall and Acceleration Due to Gravity

When an object falls under the influence of gravity alone, it is said to be in free fall. The acceleration produced by gravity affects the motion of falling objects.

Thrust and Pressure

Pressure is the force acting per unit area, while thrust is the force acting perpendicular to a surface. These concepts help explain the effects of forces on different surfaces.

Buoyancy

Buoyancy is the upward force exerted by a fluid on an immersed object. It explains why some objects float while others sink in water.

Importance of the Chapter

This chapter provides a fundamental understanding of gravity and related concepts that are essential for studying physics and understanding natural phenomena.

CBSE Exam Preparation Tips

Focus on gravitation, mass and weight, free fall, thrust, pressure, and buoyancy. Regular practice of NCERT examples, diagrams, and numerical questions will help improve conceptual understanding and examination performance.

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