For example, someone without the concept "kinetic energy" might say that when person A throws a baseball it has a lot more "hurt" than when person B throws it. The difference is the KE, even if the person doesn't know the concept by common name or know much about it.

When person C throws a baseball, it has even more hurt in it, because he aims for your head. Also may I introduce you to person N, who is a ninja and throws pointy stars...

Mr.Smith wants to kill as many kids as possible. What should he do?

Buy a flock of goats?