Defeat condemned Bournemouth to consecutive league defeats for the first time since April, though they remain a creditable sixth in the league.
Eddie Howe, the Premier League's manager of the month for October, had described Marcus Rashford's late winner for Manchester United last weekend as "a tough one" - but the Cherries were slow to start on this occasion, despite their good form.
That was largely due to Newcastle's disruptive play, however they did create the game's first opportunity as Federico Fernandez was forced to produce a last-gasp block to deny Ibe.
The opening goal filled the hosts with a confidence that Howe's side struggled to contain, before Adam Smith's injury halted the Cherries as they looked to be growing into the contest.
Smith appeared to injure his knee as he stuttered in his run-up to take a free-kick, and received oxygen before being stretchered off after a lengthy delay.
Lerma - also replaced due to injury - offered a lifeline to the visitors to set up a delicately poised second half, but Ibe squandered his side's best opportunity to rescue a point in a game where Callum Wilson, fresh from his first senior international call-up, was often left isolated.
The Cherries thought they had found a late equaliser but Dan Gosling was correctly flagged for offside after bundling in David Brooks' effort as Newcastle resisted the visitors' late pressure.
Howe's side embark on a tough run once the Premier League resumes, with Arsenal, Manchester City and Liverpool all to come within their next four fixtures.
"Adam Smith looks like he's got a knee injury, it looks quite serious. It did disrupt the flow of the game - the long delay - and obviously the players were concerned so that didn't help," said Howe.
"I was pleased with aspects of the second half, we were on the front foot more and we had the ball in some dangerous areas. We will use this time to assess the injuries and come back fresh. You are judged game by game and today was a disappointment."