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Study Plan

Work, Energy and Power — Study Plan

NIOS · Class 12 · Physics

A step-by-step study plan for Work, Energy and Power, NIOS Class 12 Physics: what to learn first, what to practise and when to revise.

45 questions39 flashcards23 formulas & key relations5 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 ideas. Focus on: 1. Work – Scientific Definition and Formula, 2. Power – Rate of Doing Work, 3. Kinetic Energy and the Work-Energy Theorem.

2
Day 3

Practise

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

3
Day 4

Revise & Test

Revise key points without looking at your notes. Take a practice quiz and mark weak areas for another pass.

4
Day 7

Spaced Revision

Come back to Work, Energy and Power after a week. Use flashcards for quick recall and try past exam questions on 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 – 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.

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