Looking at much of the commercial stuff available, a lot of well meaning (and well paid) folks know little about either. It's time to put these well meaning folks who make a lot of money somewhere else. Maybe Mars
There's a lot of awful stuff out there. It's eye-catching, and well produced, and quite entertaining, but it's awful. Really awful.
Energy and matter are very difficult concepts to master. It's OK if a 6 year old doesn't know much about Newton's Laws. What is not OK is teaching nonsense that will make it more difficult for the child to grasp science later.
Here's something from PearsonEducaton, written for 1st grade:
Where's the science?
I start each year with a classroom of sophomores who think energy means to move something. By the time I get them, this misconception is seared into millions of neuronal connections. Teaching crap is worse than teaching nothing at all.
(The gratuitous "Go Green" symbol on a page feigning science about one of the most ecologically destructive
inventions ever might, though, make a good lesson on irony. Or cynicism.)
I will be posting a variety of seemingly simple ideas for teaching young'uns some science. The goal is not to produce Junior Scientists® rattling off the scientific names of obscure penguins like some unfortunate child with Asperger's syndrome. I just want to help kids see the natural world.
I do not have a particular beef with Pearson--it came up first when I Googled elementary science instructional materials.
If you look at other companies, there seems to be equal opportunity awfulness.