Work, Energy and Power

Short Definition

Work is done when a force moves an object in the direction of the force.
Energy is the capacity to do work.
Power is the rate at which work is done.

Detailed Explanation

Work, energy, and power are closely related concepts in physics. Work requires a force and displacement. Energy exists in various forms like kinetic and potential energy. Power measures how fast work is performed.

Formulas

• Work: W = F × d × cosθ
• Kinetic Energy: KE = ½mv²
• Potential Energy: PE = mgh
• Power: P = Work / Time = W / t
• Work-Energy Theorem: Work done = Change in kinetic energy

Importance

Understanding work, energy, and power is essential for solving mechanics problems, designing machines, and explaining energy transformations in nature.