Gravitation and Hydrostatics are two fundamental topics of Physics that help us understand how forces act in nature and how fluids behave under rest. Gravitation explains the force of attraction between masses, which governs the motion of planets, satellites, falling objects, and even our weight on Earth. Hydrostatics deals with fluids at rest and helps us understand pressure in liquids, buoyancy, and why objects float or sink.
For NDA and CDS aspirants, these topics form the conceptual base for higher-level mechanics and are frequently tested through direct formula-based and conceptual MCQs. A strong foundation at the Class-7 level ensures better problem-solving ability in advanced questions later.
Gravitation (Conceptual Overview)
Gravitation is the natural force by which every object in the universe attracts every other object. On Earth, it is responsible for objects falling towards the ground and gives weight to all bodies.
Key concepts covered:
- Universal Law of Gravitation
- Mass and weight
- Acceleration due to gravity (g)
- Effect of gravity on free-falling bodies
- Importance of gravity in daily life and space science
Understanding gravitation helps aspirants visualize real-life phenomena such as planetary motion, satellites, and variations in weight.
Hydrostatics (Conceptual Overview)
Hydrostatics is the study of liquids at rest. It explains how pressure acts in fluids and why some objects float while others sink.
Key concepts covered:
- Pressure in liquids
- Dependence of pressure on depth
- Buoyancy and upthrust
- Archimedes’ Principle
- Conditions for floating and sinking
Hydrostatics is highly MCQ-friendly, with questions often based on direct application of principles and logical reasoning.
Relevance for NDA–CDS 1 (2026) Exam
- Physics in NDA/CDS is concept-driven, not memorization-based.
- Questions from gravitation and hydrostatics are usually easy to moderate and scoring.
- MCQs often test:
- Basic laws and definitions
- Cause-effect relationships
- Simple numerical reasoning
- Strong clarity at this level reduces errors in higher-class mechanics questions.
Consistent practice of MCQs from these topics can easily fetch guaranteed marks in the Physics section.
Conclusion
Gravitation and Hydrostatics form the backbone of classical Physics and play a vital role in understanding the physical world. These topics not only strengthen scientific thinking but also build confidence in solving objective-type questions for competitive exams like NDA and CDS.
For NDA–CDS 1 (2026) aspirants, mastering these fundamentals ensures accuracy, speed, and conceptual clarity in the exam. A disciplined approach—understanding theory, memorizing key formulas, and practicing MCQs—will make these chapters a strong scoring area in Physics.
