Again, I'm just using my common sense here. It's not going to be as good as having conducted scientific research, but it's better than nothing and worth mentioning.
You need to convince a group of people that you will be awesome at graduate school, and graduate school is mostly research. The best way to convince people of this is to show them good evidence that you possess the required skills and the required motivation. If you can spin your research experience or any past experiences, no matter how remotely related to physics, in such a way as to demonstrate that you possess in spades the skills that will help you in graduate school, it will be to your advantage.