Work and energy

What is work and energy?

Work is energy transferred when a force moves an object: W = F·s (when force and displacement are parallel) or W = F·s·cosθ. Measured in joules. The work-energy theorem states that the net work done on an object equals its change in kinetic energy: W = ΔKE = ½m(v² − u²). GCSE Physics introduces it via simple force × distance calculations; A-Level extends to integration when force varies with position (∫F·ds).