I have been reading a published article which tried to explain collisions between rigid and non-rigid bodies and it mentioned the following :
"The deformation prone mass in humans has been referred to as ‘‘wobbling mass’’ and is unable to transmit impact forces as effectively as rigid mass (Gruber et al., 1998). During a collision the greater the rigidity of the impacting mass, the less elastic the collision. The less elastic a collision, the greater the momentum imparted into the target or opponent (Pain & Challis, 2002)."
But I thought the more rigid a body is , the more elastic the collision, like the collision between 2 billiard balls. There is no virtually no deformation and 'kinetic energy/momentum' can be assumed conserved.
But isn't the collision between 2 rubber balls also an approximate elastic collision, which seems to contradict the billiard ball example?
So does the rigidity of an impacting mass affect the momentum transfer to the impacted mass?