Work and Energy
Madhya Pradesh Board · Class 9 · Science
Quick revision notes for Work and Energy — Madhya Pradesh Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Work
- Scientific definition of work differs from everyday usage of the term
- Two conditions must be satisfied for work to be done: (1) A force must act on an object, (2) The object must be displaced
- Work is done only when displacement occurs in the direction of applied force
Energy and Its Forms
- Energy is the capacity to do work
- Object with energy can exert force on another object and cause displacement
- Energy is measured in the same unit as work (Joule)
Kinetic Energy
- Kinetic energy is possessed by objects in motion
- Faster moving objects have more kinetic energy
- Kinetic energy depends on both mass and velocity of the object
Potential Energy
- Potential energy is stored energy due to position or configuration
- Gravitational potential energy depends on height above reference level
- Reference level (zero potential energy) can be chosen arbitrarily
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Work and Energy covers several key topics that are frequently asked in Madhya Pradesh Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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