Chapter 6 - Linear Momentum and Collisions - Learning Path Questions and Exercises - Conceptual Questions - Page 213: 4

It is due to $\Delta p=F\Delta t $.

Impulse is given by $\Delta p=F\Delta t $ ​Where pΔp is the impulse and F is the force applied over a time interval Δt.This shows that momentum change depends on either applied force or change of time.For same amount of force it is easy to increase time of contact so "follow-through" is important.