How do you make a cardboard battering ram?
A battering ram is typically used by police in order to open a locked door more quickly. Making a battering ram out of cardboard will not be as effective as a using one made out of metal, because the cardboard is not as sturdy or heavy as metal.
How did the moat drawbridge main gate portcullis gate towers and murder holes each attempt to make it difficult for attackers to use the battering ram?
There are two types. One hand held by multiple soldiers. Or the less strainful type which is mounted on a carrier, held by chains. Most battering rams were long pieces of wood, usually with metal tips. Handles would need to be attatched, or if trying to replicate the hanging ram, one would have to make a carrier and attatch the ram afterward.
The band Rammstein took its name from the Ramstein Air Base where a tragedy involving planes occured during a flight show. The word "Rammstein" doesn't really exist, but it could be explained as a different version of the "Rammbock" ("battering ram"), which would make it a "battering ram made of stone".
A scaling tower was used in ancient wars to allow soldiers to reach the top of an enemies' town or fortress walls. If a battering ram is attached to it, then scaling the walls over an entrance to a fortress or city plus using the battering ram to break open the forts doors can be accomplished. This type of war "machines" were used into the Middle Ages.
As a device intended to knock down a sealed door of some kind, a battering ram is indeed a simple machine; or, at least, it can be. For, while sophisticated battering rams have been created and utilized, the trunk of a tree can serve just as well, when and where the gate or gateway to be rammed open is appropriately sized.
There were many constructions in the past. Generally, battering rams were heavy 8to impart as much energy to that which was being battered as possible), they had to have a resilient and tough head so metal was preferred. Often beams or strips of wood were strapped together to make the bulk of the ram's body.