Skip to main content
Super TutorResources
Chapter 6 of 30
Chapter Summary

Work, Energy and Power — Chapter Summary

NIOS · Class 12 · Physics

Summary of Work, Energy and Power for NIOS Class 12 Physics. Key concepts: In Physics, When force varies and Power is defined as the rate.

45 questions39 flashcards23 formulas & key relations5 concepts

Interactive on Super Tutor

Studying Work, Energy and Power? Get the full interactive chapter.

Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for chapter summary and more.

Try Super Tutor — Free

Free trial, no card needed.

An illustration showing a block being pulled by a constant force F at an angle theta to the horizontal displacement S, with the formula W = F ⋅ S = FS cosθ.
Super Tutor

One of 3 illustrations for Work, Energy and Power in Super Tutor — alongside flashcards, concept maps and practice questions.

Overview

Work, Energy and Power are three of the most fundamental and interconnected concepts in Physics. In our daily life, we use the word 'work' loosely — studying, lifting, pushing — but in Physics, work has a very precise and specific meaning. This chapter builds on Newton's Laws of Motion and introduce

Key Concepts

In Physics

In Physics, work is done when a force causes displacement. If a constant force F acts on an object and produces a displacement d, and the angle betwee

When force varies with position (like

When force varies with position (like a spring force), we cannot directly use W = Fd cosθ. Instead, we divide the path into tiny intervals Δx where fo

Power is defined as the rate

Power is defined as the rate at which work is done. Average Power: P = ΔW/Δt. Instantaneous Power: P = dW/dt = F·v (force times instantaneous velocity

Kinetic Energy (KE) is the energy

Kinetic Energy (KE) is the energy possessed by an object due to its motion: KE = ½mv². Derivation: Using Newton's second law F = ma and the equation o

Potential Energy is energy stored by

Potential Energy is energy stored by virtue of an object's position or configuration. Gravitational Potential Energy: When a mass m is lifted through

Learning Objectives

  • Define work done by a constant and variable force, and calculate it using the formula W = Fd cosθ
  • Understand and apply the concept of work done by a spring using Hooke's Law: W = ½kx²
  • Define power and calculate average and instantaneous power; convert between watt, kilowatt, horse power, and kWh
  • State and apply the Work-Energy Theorem: Work done = Change in Kinetic Energy
  • Understand kinetic energy and derive the formula KE = ½mv²

Frequently Asked Questions

What are the important topics in Work, Energy and Power for NIOS Class 12 Physics?
Key topics in Work, Energy and Power include Work – Scientific Definition and Formula, Power – Rate of Doing Work, Kinetic Energy and the Work-Energy Theorem, Potential Energy – Gravitational and Elastic. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Work, Energy and Power for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Work, Energy and Power. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Work, Energy and Power

All NIOS Class 12 Physics Chapter Summary

For serious students

Get the full Work, Energy and Power chapter — start free.

Quizzes, flashcards, an AI doubt solver and a study plan for NIOS Class 12 Physics. Free to start, no card needed.

Try Super Tutor Free
Try this chapter free