OK, after everyone has beaten the "Hitting vs. Battering Ram Analogy" to death (pun intended ) try the Swinging vs. Trebuchet Analogy. I have no idea if it applies or if it can be explained in TGM terms, but it sure will be fun having everyone run out and Google "trebuchet".
My daughter and I built one of these contraptions for her science project last year. Ours was unique compared to the others. Ours was driven by weights, the weight drops and pulls the pulley around a pivot center which has an arm and a rope and sling on the end. I small amount of weight creates a ton of CF and you'd be amazed how far you can throw a small watermelon!
) try the Swinging vs. Trebuchet Analogy. I have no idea if it applies or if it can be explained in TGM terms, but it sure will be fun having everyone run out and Google "trebuchet". 
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