Work, Energy and Power in Physics Complete Theory
The work energy and power in physics are fundamental concepts that explain how forces act in nature and how energy is transferred or transformed in systems.
What Is Work?
In physics, work is said to be done when a force causes a displacement of an object in the direction of the force.
Mathematically:
Work (W) = Force (F) × Displacement (s) × cosθ
where θ is the angle between force and displacement.
What Is Energy?
Energy is the capacity of a body to do work. It exists in various forms such as kinetic energy, potential energy, thermal energy, etc.
- Kinetic Energy (KE): Energy of motion = ½mv²
- Potential Energy (PE): Energy due to position = mgh
What Is Power?
Power is the rate at which work is done or energy is transferred.
Power (P) = Work done (W) / Time taken (t)
The SI unit of power is the watt (W).
• A body with higher speed or greater mass has more kinetic energy.
• Work and energy are scalars and have the same SI unit — the joule (J).
• Power tells how fast work is done.
Work, Energy and Power in Physics Complete Theory
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Work, Energy and Power in Physics Complete Theory