NDA/CDS Physics 2026 – Work, Energy & Power (कार्य, ऊर्जा, शक्ति) | Bilingual Class by Maxwell Sir

Welcome to Physics Class 01 by Maxwell Sir, your trusted mentor for NDA, CDS, BSF, ICG, and Airforce 2026 preparation.
In this detailed lecture, we begin your journey with one of the most fundamental yet high-scoring chapters — Work, Energy, and Power (कार्य, ऊर्जा, शक्ति).

This topic forms the base for Mechanics, one of the most question-rich sections in the NDA and Defence Physics syllabus. Whether you’re a beginner or revising your concepts, this video will guide you step-by-step from basic theory to advanced problem-solving techniques.

📘 What You’ll Learn in This Lecture:

1️⃣ Concept of Work (कार्य):
 • Definition of work in physics and conditions for work to be done.
 • Formula for work done by a constant force (W = F × s × cosθ).
 • Positive, negative, and zero work examples in daily life and NDA questions.

2️⃣ Energy (ऊर्जा):
 • Concept and types of energy – kinetic, potential, mechanical, heat, and chemical energy.
 • Derivation of kinetic energy formula and relation between work and energy.
 • Concept of potential energy in gravitational fields and elastic systems.

3️⃣ Power (शक्ति):
 • Definition, formula (P = W/t), and SI unit of power.
 • Instantaneous and average power explained with numerical examples.
 • Relation between power, force, and velocity (P = F·v).

4️⃣ Work-Energy Theorem:
 • Derivation and applications of the theorem in solving NDA numerical problems.
 • Real-life connection between work done and change in kinetic energy.

5️⃣ Law of Conservation of Energy:
 • Explanation through examples – free fall, pendulum motion, projectile motion, and springs.
 • How energy transforms but total energy remains constant.

6️⃣ Numerical Problem Solving:
 • Step-by-step NDA-level numerical problems with shortcut methods.
 • Tricks to solve questions under 30 seconds for MCQ-based exams like NDA, CDS, Airforce & Navy.

7️⃣ PYQs and Real-Life Examples:
 • Past Year NDA & CDS questions solved with explanation.
 • Real-life application of energy and power concepts (car acceleration, lifting weights, etc.).

🧠 Why You Should Watch This Video:

✔️ Explained in both Hindi & English for easy understanding.
✔️ Based on NDA, CDS, BSF, ICG, Airforce 2026 syllabus.
✔️ Covers NCERT + Defence-specific topics with real exam focus.
✔️ Includes short tricks, formulas, derivations, and live examples.
✔️ Perfect balance between theory and numericals.
✔️ Builds strong foundation for Physics Paper (Objective + Conceptual Questions).

🧩 Who Should Watch This Video:

🔹 NDA, CDS, Airforce, BSF, ICG Aspirants (2025–2026)
🔹 Class 11–12 Students preparing for competitive exams
🔹 Beginners looking to strengthen Physics concepts
🔹 Students aiming to score full marks in Defence Physics

🗂️ Chapter Series Overview:

This is Lecture 01 of the complete NDA Physics Series.
Upcoming topics include —
👉 Laws of Motion
👉 Circular Motion
👉 Gravitation
👉 Thermodynamics
👉 Electricity and Magnetism
👉 Wave and Light Optics
👉 Modern Physics

Each topic will include theory, solved numericals, short tricks, and PYQs discussed in detail.
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