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Work, Energy and Power

NIOS · Class 12 · Physics

Step-by-step guide to study Work, Energy and Power in NIOS Class 12 Physics. Topics to cover, practice strategy, and time allocation.

45 questions39 flashcards5 concepts

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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.
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Study Plan

1
Day 1–2

Learn the Theory

Read the textbook chapter carefully. Note down definitions, formulas, and key concepts.

2
Day 3

Practice Problems

Solve textbook exercises and additional practice questions. There are 45 questions available for this chapter.

3
Day 4

Revise & Test

Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding. Mark weak areas for re-revision.

4
Day 7

Spaced Revision

Revisit Work, Energy and Power after a week. Use flashcards for quick recall. Solve previous year questions from this chapter.

What to Focus On

  • W = Fd cosθ — Work equals force times displacement times cosine of angle between them
  • Work is a scalar quantity with SI unit Joule (J) and dimension [ML²T⁻²]
  • No displacement or force perpendicular to displacement means zero work done

  • For variable force, work = area under Force-displacement (F-x) graph
  • Hooke's Law: Spring force Fs = −kx, where k is spring constant in N/m
  • Work done by external force on spring = (1/2)kx² — this is stored as elastic potential energy

  • Power = Work done / Time taken = W/t, and also P = F·v (force times velocity)
  • SI unit of power is Watt (W) = J/s; Dimensional formula is [ML²T⁻³]
  • 1 kW = 10³ W; 1 MW = 10⁶ W; 1 hp = 746 W

Common Mistakes to Avoid

If a force is applied on an object and the object moves, work is always done by that force.

Negative work means the force is doing something harmful or incorrect — it is an error in calculation.

The work-energy theorem means that if the net work done on a body is zero, the body must be at rest.

Memory Tips

Definition of Work: W = F × d × cosθ

Work is a scalar quantity despite force and displacement being vectors

Positive, Negative, and Zero Work

Hooke's Law and Spring Constant: F = kx

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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, Energy and Power — Complete Concept Map, How to Correctly Calculate Work Done — Step by Step, Work, Energy and Power - Full Chapter Mind Map. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Work, Energy and Power — NIOS Class 12 Physics?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and 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.

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