My daughter came home with this assignment (see PDF link below) tonight. Am I right to be concerned when they equate power with force, and size with mass? Or am I just over-blowing this for 2nd grade? https://dl.dropboxusercontent.com/u/49570443/homework.pdf [Broken] I explained to her that push and pull are just opposites of one another; negative and positive forces since she is familiar with negative numbers. Then explained that size has nothing to do with it, rather weight (I did not discuss mass), and explained a bowling ball and soccer ball are the same size yet require different forces to move. Then explained energy as what it takes to move an item from one location to another, while more power is required to get it there faster. Is this a preview of what's to come? Maybe this is out of the "common core" curriculum, which doesn't get my hopes up. I'll ask her teacher where she found it.