Impulses (AQA A-Level Further Maths): Flashcards

Change in momentum when a force acts over time

$I = F \times t$

$I = mv - mu$

Yes, direction matters - use positive/negative signs

Newton-seconds (Ns) or kg m s$^{-1}$

$I = \int_{0}^{t} F \, dt$

Impulse always equals change in momentum

Impulses are equal in magnitude but opposite in direction

Zero (no friction, so momentum conserved in that direction)

When force varies with time (not constant)