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

Energy transferred when force causes displacement

$W = F \times d$ (Force × Distance)

Joules (J) or kilojoules (kJ)

Rate at which work is done

Watts (W) or kilowatts (kW)

$P = F \times v$ (Force × Velocity)

$T \cos \theta$

Driving force equals resistance forces

Always oppose the direction of motion

$D = kv^n$ where $k$ is constant, $n$ between 1-2

Driving force equals total resistance forces

$KE = \frac{1}{2}mv^2$

$P = \frac{W}{t}$