Principle of pile driver

The answer upstairs focuses on energy conversion.

In the process of piling, the conservation and transformation of energy is very important.

But the conservation and transformation of momentum is also very important: according to the physical formula in high school textbooks: mv-m'v'=m"v, the product of mass m and velocity v before and after collision is conserved.

To put it simply, piles, things with a size of m, have a high speed (high speed is because there is a great potential energy converted into kinetic energy); It suddenly stops after colliding with the land, that is, V changes greatly before and after the collision, which will inevitably produce a great momentum difference.

This momentum difference is transmitted to the land, and the land generates speed and presses down.