Use the formula ( J = F Delta t )
If force is not constant, use ( J = int F , dt )
Find the force ( F )
Find the time interval ( Delta t )
Multiply force by time for constant force
Integrate force over time for variable force
Use ( J = Delta p )
Find initial momentum ( p_i = mv_i )
Find final momentum ( p_f = mv_f )
Subtract to get impulse ( J = p_f – p_i )
Use units of newton-second ( text{N·s} ) or kilogram-meter per second ( text{kg·m/s} )