Give me all the formula of work and energy chapter of class 9
Answer (1)
11th Dec, 2024
Key Formulas for Work, Energy, and Power in Class 9 Physics
Work done by a constant force:
- W = F × s
Where:
- W = Work done (Joule, J)
- F = Force applied (Newton, N)
- s = Displacement of the object in the direction of the force (meter, m)
Kinetic energy of a moving object:
- KE = 1/2 × m × v²
Where:
- KE = Kinetic energy (Joule, J)
- m = Mass of the object (kilogram, kg)
- v = Velocity of the object (meter/second, m/s)
Potential energy of an object at a height:
- PE = m × g × h
Where:
- PE = Potential energy (Joule, J)
- m = Mass of the object (kilogram, kg)
- g = Acceleration due to gravity (approximately 9.8 m/s²)
- h = Height of the object above the ground (meter, m)
Law of Conservation of Energy
- Total energy of an isolated system remains constant:
- Initial total energy = Final total energy
- Kinetic energy + Potential energy = Constant
Power:
- P = W / t
Where:
- P = Power (Watt, W)
- W = Work done (Joule, J)
- t = Time taken (second, s)
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