Physics has a gender problem and to see an example you need look no further than the list of this blog's authors to your left. You'll note that all of us are male. A broader look into this problem yields what is known as the "scissors diagram".
I've written about previously, but we are having a much harder time fixing it than fields like math or chemistry.
There are a lot of ideas as to why this might be the case but here's one from a Physics Today article that I hadn't considered before - problem sets based on cars and construction equipment. I recommend reading the whole article as it is well-written and insightful, but allow me to over-simplify the basic argument: homework problems in introductory physics courses generally use examples from topics like cars and construction work that are more likely for men to be familiar with than women.
My initial reaction was skepticism - how much difference can using terms like "pile driver" instead of "a machine that drops a heavy weight on [a metal rod], lifts the weight, and drops it again" possibly make? But the more I think about it, the more I start to think that maybe the authors have a point. I don't think that the real issue is that men are more familiar with pile drivers than women - I think the issue is that when textbook problems appeal more to men than women, a subtle message is sent that women are out of place in physics, and no one wants to feel out of place.
Now don't get me wrong - I'm not arguing that physics problems should avoid real-world examples or that women can't understand problems talking about cars going around banked turns - but I do think it would be wise for physics faculty to try to use more examples from fields that have a higher concentration of women - like health care or preforming arts. Instead of asking questions about baseball and football only, mix in some questions about ballet. Ask more questions about blood pressure and less about pneumatic nail guns. I'm sure this single step won't fix the larger problem, but I think it's generally a good idea to do everything we can to attract the best people to our field and not just the best men.