foreach (Vector3 vertexPos in vertexList)
{
    vertexPos += (force / distanceToImpactPoint.sqrMagnitude) * impactDir;
}

foreach (Vector3 vertexPos in vertexList)
{
    float attenuatedForce = (force / distanceToImpactPoint.sqrMagnitude);
    float nDotD = Vector3.Dot(impactDir, currVertexNormal);
    vertexPos = attenuatedForce * nDotD * Vector3.Lerp(impactDir, currVertexNormal, nDotD);
}