Force, Mass, and Momentum (Leaving Cert Physics): Flashcards

$p = mv$ (mass × velocity)

Vector (has magnitude and direction)

kg m s⁻¹ (kilogram metre per second)

Body at rest/constant velocity unless net external force acts

Tendency of objects to resist changes in motion

$F = ma$ (force = mass × acceleration)

$F = \frac{\Delta p}{\Delta t}$ (rate of change of momentum)

Constant speed when air resistance equals weight

Weight = air resistance, net force = 0, acceleration = 0

For every action force, equal and opposite reaction force

Equal magnitude, opposite direction, act on different objects

80,000 kg m s⁻¹ east