Work-Energy Theorem
The principle stating that net work done by all forces acting on an object equals the net change in its kinetic energy.
Governing formula
W_net = ΔKE = ½ m vf² - ½ m vi²
SI unit
J
In depth
Positive net work increases kinetic energy and speed, while negative net work decreases kinetic energy and speed.
Examples in the real world
Braking forces doing negative work on a car to reduce its kinetic energy to zero during a stop.