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Work and Energy

Maharashtra Board · Class 9 · Science

Quick revision notes for Work and Energy — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.

45 questions22 flashcards5 concepts

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Key Topics to Revise

1

Work

  • Work is done when a force applied on an object causes displacement of the object
  • Work = Force × Displacement (when force and displacement are in same direction)
  • When force is at an angle θ to displacement: W = F × s × cos θ
2

Energy and Its Forms

  • Energy is the capacity of a body to perform work
  • Energy has the same unit as work - Joule (J) in SI system
  • Energy exists in various forms: mechanical, heat, light, sound, chemical, nuclear, solar
3

Kinetic Energy

  • Kinetic energy is the energy possessed by an object due to its motion
  • Moving objects can do work when they strike stationary objects
  • Kinetic energy depends on mass and velocity of the object
4

Potential Energy

  • Potential energy is stored energy due to position or state of an object
  • Gravitational potential energy depends on height above reference level
  • PE is directly proportional to mass, height, and acceleration due to gravity

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Full Notes

Key Concepts

Work is done when a forceKinetic energy is the energy possessedPotential energy is the energy storedEnergy can neither be created norPower is the rate of doing

Frequently Asked Questions

What are the important topics in Work and Energy for Maharashtra Board Class 9 Science?
Work and Energy covers several key topics that are frequently asked in Maharashtra Board Class 9 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 — Maharashtra Board Class 9 Science?
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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