a hip-hop touring group that teaches physical science

I can't tell. I would hope (and expect) that their lyrics teach physical science.

Or it's just a group of young people singing in hip-hop style to attract youngsters to come around and listen to someone teaching science subjects?

http://www51.honeywell.com/hhs/news-events-details/FMAFallLiveTour2009.html

Excerpt:

The innovative, traveling hip-hop science concert will reach over 16,000 students during its 10-week, 20-city tour of the United States and Canada. Named for Sir Isaac Newton’s second law of motion (force = mass x acceleration) FMA Live! uses professional actors, original songs, music videos and interactive science demonstrations to teach middle school students Newton’s three laws of motion and universal law of gravity

Excerpt:

During each FMA Live! performance, students, teachers and school administrators interact with three professional actors in front of a live audience to experience Newton’s laws firsthand. A giant sticky wall is used to demonstrate inertia; go-carts driven across the stage illustrate action and reaction; and ‘extreme’ wrestling and a huge soccer ball show that force is determined by mass multiplied by acceleration. All three of Newton’s laws are demonstrated simultaneously when a futuristic hover chair collides with a gigantic cream pie. Educator and student feedback is consistently and overwhelmingly positive after each tour stop.

Here's the group's website:

http://www.fmalive.com/