In my article (Featonby 2015 Phys. Educ . 50 [http://dx.doi.org/10.1088/0031-9120/50/6/768] 768
[http://dx.doi.org/10.1088/0031-9120/50/6/768] ) I asked what happens when a large mass is placed
between an impacting force and fragile item? Here I discuss the answers.