In classical mechanics, linear momentum is a force F applied to a particle for a time interval Δt . So if the F is big and time is long, then the momentum is big.
Momentum: ΔM=F*ΔT
where, ΔT = Time Change, F = Force, P= Momentum Change.
For example, when F = 60N, ΔT = 5s, tehn momentum = 300kg-m/s.