It is usually said that you can minimize the damage caused by a car crash by increasing its duration. This way the impulse (F x dt) will be the same, but the F component wil decrease and hence the acceleration for the passengers. For example, by manufacturing the cars of steel that is deformable, you make them stick to each other and thus travel together during more time, instead of bouncing off and accelerating sharply. Logically, the opposite is also true: by chosing an elastic naterial, you would reduce collision time and increase the damage. But I wonder if you can obtain this result without changing the actors, without altering the display, just by reducing the interaction time.
For example, the bird pecks at the wood of the tree. Of course, thus the surface exposed to the force is reduced and this maximizes the presure and the impact of the force. But the bird also uses quick repeated movements for some reason, doesn't it?
I tend to think that the same rationale lies behind in both cases.
When the interaction time increases with a deformable car, it is because this material is like a coward army with little cohesion. If the soldiers (molecules) are hit and displaced, there is no courage (restoring force) making them strike back, so they are disbanded (potential energy is not re-converted into kinetic energy). Hence the non-bouncing off and the longer interaction time.
When the interaction time decreases out of the sheer will of the bird, the effect is that its beak, even if it faces a brave army, just hits a couple of soldiers and retreats before they can obtain assistance from their colleagues... This would be a sort of hit & run strategy, guerrillas war... reducing the attack time and maximizing the force?
Well, that is what I initially thought but have doubts...