Force is how hard something is being pulled, not how fast it is moving. Even if gravity were to “stop” midway to the effect that F = ma = m*0 = 0, the object would still be moving and falling. What you have left is momentum i.e., velocity times mass. A faster moving object means more momentum.
Where acceleration is a = F/m = d / t^2, and v = d / t, we can substitute v = a * t = F * t / m.
Velocity is proportional to how much time the force is applied. Momentum is proportional to velocity. The faster the object, the more momentum will need to be transferred. More transferred momentum is like a bigger “hit” to the receiving object.
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