Work, Energy and Power
Madhya Pradesh Board · Class 11 · Physics
Quick revision notes for Work, Energy and Power — Madhya Pradesh Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Scalar Product of Vectors
- Scalar product (dot product) of two vectors A and B is written as A·B
- Result is a scalar quantity, not a vector
- Geometrically represents projection of one vector onto another
Work and Work-Energy Theorem
- Work is done when force causes displacement
- Work is a scalar quantity that can be positive, negative, or zero
- No work is done if: displacement is zero, force is zero, or force is perpendicular to displacement
Kinetic Energy
- Kinetic energy is energy possessed by virtue of motion
- Always positive scalar quantity
- Depends on mass and square of velocity
Potential Energy
- Potential energy is stored energy due to position or configuration
- Associated only with conservative forces
- Can be converted to kinetic energy and vice versa
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