We did a nature walk for science yesterday - from inside the house. We stood at the back sliding glass door and looked outside instead of actually going outside. Hey, it was 104 F officially in Houston! It was probably only 101 or so at our house, but I had no desire to spend even a few minutes yesterday afternoon wandering around the backyard looking for natural inclined planes.
We found a few, even from through the window: the deck railing, the slide, and the ditch behind the house (we don't have hills here, so a ditch is the best we could do for a slope).
In any case, I think my daughter understands the concept of inclined planes after this week. We raced toy cars down a sloping piece of cardboard, we raced water drops down a wax-paper-covered cookie sheet, and we watched a BJU science video on friction. We skipped the painting project this week. Our teacher guide suggested rolling paint-dipped marbles down a piece of cardboard. I made an executive decision that this would be too messy, as I could easily imagine paint-covered marbles ending up all over the floor.
I've looked over the BJU Science 1 videos and found quite a few that should fit in nicely with our Intro to Science class. I'll just change the order around a bit, showing 1 or 2 a week usually. We'll probably skip the worksheets and their experiments - just watching the teacher do them, since we have plenty to do on our own anyway. The BJU class seems to also be a mostly introductory class, discussing a wide variety of topics, none of which contradict my own old earth beliefs. So it is a nice add-on to our original science plans.