Work, Power & Drag Forces (Leaving Cert Applied Maths): Flashcards

Energy transferred when force causes displacement

$W = F imes d$ (Force × Distance)

Joules (J) or kilojoules (kJ)

Rate at which work is done

Watts (W) or kilowatts (kW)

$P = F imes v$ (Power = Force × Velocity)

P = rac{W}{t} (Power = Work / Time)

They increase as speed increases

$D = kv^n$ where $n$ is typically between 1 and 2

$D = kv^2$

Driving force = Resistance forces

Driving force equals total resistance forces

KE = rac{1}{2}mv^2