posted by Richard .
: When the mass hits the pile, it has kinetic energy. This energy is transformed into other forms of energy as the speed of the falling mass rapidly reduces to zero. As this happens, the pile is forced a small distance into the ground.
question: Explain how a large force is produced when the pile is driven a short distance into the ground ?
The "large force" consists of soil pressure (at the end)and friction (on the sides) of the pile as it pentrates the ground.
Most of the kinetic energy of the mass is transformed to work
W = (force) x (penetration distance)
as the pile penetrates the ground, and that work is converted to ground heating and rock breaking.