Work Energy Calculator
Work Done (W = Fd cos θ)
Kinetic Energy (KE = ½mv²)
Formula
W = F × d × cos(θ) for work done. KE = ½mv² for kinetic energy. Both measured in joules (J).
Frequently Asked Questions
What is the work-energy theorem?
The work-energy theorem states that the net work done on an object equals the change in its kinetic energy: W_net = ΔKE = ½mv₂² − ½mv₁².
When is work zero?
Work is zero when the force is perpendicular to the displacement (θ = 90°), since cos(90°) = 0. For example, the normal force on a sliding object does no work.