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Work, Energy and Power — Revision Notes

ICSE · Class 11 · Physics

Work, Energy and Power revision notes for ICSE Class 11 Physics: 4 topics in quick points. Part of the ICSE Class 11 Physics syllabus.

44 questions40 flashcards16 formulas & key relations5 concepts

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Graphs showing the variation of kinetic energy, potential energy, and total energy with respect to both displacement and time for a particle executing Simple Harmonic Motion.
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Key Topics to Revise

1

Work and Its Sign

  • Work is done only when a force causes actual displacement.
  • Work is a scalar quantity because it is the scalar product of force and displacement.
  • Work depends on the angle between force and displacement.
2

Work Done by Variable Force

  • Many physical forces change with position, such as spring force and rocket thrust.
  • For a variable force, work is the area under the force-position graph.
  • The smaller the strip width in the graph, the more accurate the work calculation becomes.
3

Units, Dimensions, and Power

  • The SI unit of work is joule.
  • The CGS unit of work is erg.
  • 1 joule = 10^7 erg.
4

Kinetic Energy and Work-Energy Theorem

  • Kinetic energy is the energy of a moving body.
  • Kinetic energy is equal to the work done in bringing a body from rest to its present speed.
  • Kinetic energy depends on speed squared, so speed has a stronger effect than mass.

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Full Notes

Key Concepts

Work is done only whenKinetic energy is the energyThe work done by a forcePotential energy is the energy dueA conservative force is one

Frequently Asked Questions

What are the important topics in Work, Energy and Power for ICSE Class 11 Physics?
Key topics in Work, Energy and Power include Work and Its Sign, Work Done by Variable Force, Units, Dimensions, and Power, Kinetic Energy and Work-Energy Theorem. Study these first, then practise questions on each for Class 11 exams.
How should I revise Work, Energy and Power for Class 11 exams?
Learn the core ideas first, then work through the 44 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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All ICSE Class 11 Physics Revision Notes

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