The Magpies ran out 3-1 winners thanks to goals from Harvey Barnes, Jacob Murphy and Alexander Isak, with Eddie Howe naming different XIs in each half.
Barnes fired United ahead after five minutes when he cut inside and fired home with a trademark finish.
The second goal arrived in the 24th minute after a superb move, which resulted in Sean Longstaff finding Barnes, who cut the ball back to Jacob Murphy to sweep past the goalkeeper.
More slick approach involving Murphy and Barnes saw Isak cannon a shot against the crossbar, but he was on the scoresheet on the stroke of half time.
Last season's 25-goal top scorer raced in on goal and finished smartly in the 43rd minute.
A much younger side played in the second period - Ben Parkinson's substitute appearance at Bournemouth last term was so far the only senior match for Newcastle United between them, although 42-cap Greece international Odysseas Vlachodimos replaced Nick Pope in goal.
Parkinson and Garang Kuol both had opportunities to add to the scoreline before Simon Skarlatidis pulled one back from the spot for the German side, but it was a strong start to United's pre-season preparations.
Newcastle United (first half): Nick Pope, Jamal Lewis, Emil Krafth, Dan Burn (c), Lewis Hall, Jacob Murphy, Joelinton, Sean Longstaff, Joe White, Harvey Barnes, Alexander Isak
Newcastle United (second half): Odysseas Vlachodimos, Jamie Miley, Cathal Heffernan, Ellis Stanton, Leo Shahar, Johnny Emmerson, Jay Turner-Cooke, Alfie Harrison, Trevan Sanusi, Garang Kuol, Ben Parkinson (c)