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Work and Energy

NIOS · Class 10 · Science & Tech

Quick revision notes for Work and Energy — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

44 questions20 flashcards5 concepts

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An illustration showing three scenarios: a person pushing a wall (no displacement, no work), a person carrying a load and walking on a level road (force and displacement perpendicular, no work against
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Key Topics to Revise

1

Work - Definition and Conditions

  • Work is done only when force is applied AND the object moves in the direction of force
  • If force is applied but no displacement occurs, work done is zero (e.g., pushing a wall)
  • If force and displacement are perpendicular to each other, work done is zero
2

Energy - Definition and Forms

  • Energy is the capacity to do work
  • Energy has the same unit as work - Joule (J)
  • Energy exists in many forms: mechanical, thermal, light, electrical, sound, magnetic, nuclear
3

Energy Transformations

  • Energy can be converted from one form to another but cannot be created or destroyed
  • Examples: Electric bulb (electrical → light), fan (electrical → mechanical), microphone (sound → electrical)
  • In a dam: PE of water → KE of falling water → rotational KE of turbine → electrical energy
4

Power

  • Power is the rate of doing work or rate of energy consumption
  • Power = Work done ÷ Time taken
  • SI unit is Watt (W), also measured in Horse Power (HP)

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Full Notes

Key Concepts

Work is done when a forceEnergy is the capacity ofEnergy possessed by a body dueEnergy possessed by a body dueThe process of converting one form

Frequently Asked Questions

What are the important topics in Work and Energy for NIOS Class 10 Science & Tech?
Work and Energy covers several key topics that are frequently asked in NIOS Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Work and Energy — NIOS Class 10 Science & Tech?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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