Work, Power, and Energy are fundamental concepts in Physics that help us understand how objects move and how forces act in our daily lives. From lifting a school bag to running, jumping, or even switching on a fan, these concepts explain how physical activities are performed. For NDA and CDS aspirants, building a strong foundation at the Class 5 level is essential, as these basics later develop into advanced applications tested in competitive examinations. This chapter focuses on simple definitions, everyday examples, and basic numerical understanding, making it easier for students to grasp the core ideas clearly.
Work
In Physics, work is said to be done when a force applied on an object causes it to move in the direction of the force. If there is no movement, then no work is done, even if force is applied.
Example:
- Pushing a wall does not involve work (no movement).
- Lifting a book from the ground involves work.
Work is measured in joules (J). Understanding this concept is crucial for solving MCQs based on real-life situations.
Energy
Energy is the capacity to do work. Without energy, no work can be performed. Energy exists in various forms such as mechanical energy, heat energy, light energy, and sound energy.
Common examples include:
- A moving car has energy.
- Food gives us energy to work.
Energy is also measured in joules (J). Questions often test the ability to identify different forms of energy.
Power
Power is the rate at which work is done or energy is used. It tells us how fast a task is completed.
Example:
- Two students may climb stairs, but the one who climbs faster has more power.
Power is measured in watts (W). This concept helps compare efficiency and speed of work.
Relevance for NDA CDS 1 2026 Exam
For NDA and CDS 1 2026, questions from Work, Power, and Energy are generally concept-based and numerical, often linked to real-life situations. A clear understanding of definitions, units, and simple formulas is enough to score well. MCQs are usually straightforward but require careful reading and strong fundamentals.
Conclusion
Work, Power, and Energy form the backbone of Physics and are essential for understanding motion and force. Mastery of these basic concepts at the Class 5 level builds confidence and accuracy for competitive exams like NDA CDS 1 2026. Regular practice of MCQs, clear understanding of definitions, and relating concepts to daily life will help aspirants perform well in the examination.
