Work, Energy and power

Work is done when a force

Work is done when a force acts on a body and causes displacement. Mathematically, W = F × s × cos θ, where F is force, s is displacement, and θ is the

Energy is the capacity to do

Energy is the capacity to do work. It exists in various forms: kinetic energy (due to motion, KE = ½mv²), potential energy (due to position, PE = mgh

Power is the rate of doing

Power is the rate of doing work or energy transfer. P = W/t = F × v, where W is work done, t is time taken, F is force, and v is velocity. SI unit is

This theorem states that work done

This theorem states that work done on a body equals the change in its kinetic energy: W = ΔKE = ½mv² - ½mu². This connects the concepts of force, disp

Energy cannot be created or destroyed

Energy cannot be created or destroyed; it can only be transformed from one form to another. In mechanical systems without friction, total mechanical e