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Work, Energy and Power — Revision Notes

CBSE · Class 11 · Physics

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

138 questions70 flashcards15 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Scalar Product and the Idea of Work

  • The scalar product or dot product of two vectors gives a scalar quantity.
  • Work in physics depends on the component of force along displacement.
  • If force and displacement are perpendicular, work is zero.
2

2. Work-Energy Theorem

  • The change in kinetic energy of a particle equals the work done on it by the net force.
  • For constant force, the theorem follows from the kinematic relation v^2 - u^2 = 2as.
  • For variable force, the theorem is written using integration.
3

3. Work Done by Constant Forces

  • Work depends on force, displacement, and the angle between them.
  • If displacement is zero, work is zero even if force is large.
  • If force is zero, work is zero even if displacement is large.
4

4. Kinetic Energy

  • Kinetic energy is the energy of motion.
  • It is always a scalar quantity.
  • It depends on mass and the square of speed.

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Full Notes

Key Concepts

The dot product of two vectorsWork done by a constant forceThe change in kinetic energyKinetic energy is K = 1/2If force changes with position

Frequently Asked Questions

What are the important topics in Work, Energy and Power for CBSE Class 11 Physics?
Key topics in Work, Energy and Power include Scalar Product and the Idea of Work, Work-Energy Theorem, Work Done by Constant Forces, Kinetic Energy. 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 138 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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