D.C.-area children will get a glimpse into what makes the perfect Max Scherzer slider, along with “Howie do it” — hit a grand slam, that is — at the soon-to-open National Children’s Museum in downtown D.C.

That’s right — the museum with a STEAM (science, technology, engineering, arts and math) focus set to open next month will include a physics-oriented baseball exhibit sponsored by the the Washington Nationals’ owners foundation, The Annette M. and Theodore N. Lerner Family Foundation.

The 10-year partnership between the museum and the Lerners includes a $200,000 gift, which will fund “Pitch Perfect” and “Grand Slam Science,” interactive exhibits that will be branded with the Nationals logo and feature Washington Nationals players. The pitching exhibit will include a green screen and give visitors the ability to feel how stance, grip, aim and speed affect the accuracy of a pitch; the hitting exhibit will teach the mechanics of batting through a simulation.

The…