Work, Energy and Power
Kerala Board · Class 12 · Physics
Quick revision notes for Work, Energy and Power — Kerala Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Work Done by a Force
- Work is a scalar quantity defined as the dot product of force and displacement
- Work depends on force magnitude, displacement magnitude, and angle between them
- Work is positive when force and displacement are in same direction (θ = 0°)
Work Done by Springs and Variable Forces
- Springs obey Hooke's law: F = -kx where k is spring constant
- Spring force is always opposite to displacement from equilibrium
- Work done by external force on spring is positive, by spring force is negative
Kinetic Energy and Work-Energy Theorem
- Kinetic energy is energy of motion, depends on mass and velocity squared
- Work-energy theorem: net work equals change in kinetic energy
- Kinetic energy is always positive (v² is always positive)
Potential Energy
- Potential energy is stored energy due to position or configuration
- Gravitational PE depends on height above reference point
- Elastic PE stored in compressed or stretched springs
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Work, Energy and Power covers several key topics that are frequently asked in Kerala Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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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
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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