This is one in a series of previews on Friday night's high school football games.For Karns City, it's all about momentum.“Momentum is what you believe in,” Gremlins coach Ed Conto said. “Our kids have been gaining in that area.“What kind of momentum does Punxsutawney have right now? We have to find that out.”The Gremlins (2-2) host the Chucks (1-3) at 7 p.m. Friday at Diehl Stadium. KC has won its last two games, defeating Redbank Valley 42-28 and St. Marys 61-6.After pulling off its miracle comeback in an overtime win at Moniteau, the Chucks were shut out by Brookville, 36-0, last week.“They've got a quarterback who can throw or run the ball,” Conto said. “They also do a lot of option reads with him, so we have to be disciplined on defense. We haven't faced a team that does that (option reads) yet.”Dylan Ishman has thrown for 440 yards and seven touchdowns. He has rushed for a net 91 yards, but was sacked seven times last week as the Chucks managed negative one yard in total offense against Brookville.Tyler Richardson has 18 catches for 280 yards and five TDs for Punxsutawney.Karns City rushed for 545 yards against St,. Marys. Dalton Beham has 338 yards rushing on the year, Sebastian Troutman 267 and Clay Garing 246.“We don't have the breakaway back this year, so we have to grind the ball downfield to be effective,” Conto said. “We're getting better at that.“We're young and I expected us to have to correct mistakes. High school football teams are more even talent-wise than most people think. Confidence and technique make the difference. We've been having the kids focus on one particular technique each week, get that down, then we move on to something else. We're slowly improving.”The Gremlins hold an 8-1 lead over the Chucks in the series between the teams. The loss was a 31-0 decision in 2010.KC has outscored Punxsutawney 208-28 in their last four meetings, including a 47-0 win last year.Seneca Valley (1-2, 1-1)at Cent. Catholic (3-1, 2-0)7:30 p.m., FridayHighmark StadiumSeneca Valley picked up its first win last week in a 35-0 Northern Seven Conference win over Butler. ... Junior RB Noah Mancuso rushed for 142 yards on just 16 carries. ... Sophomore QB Gabe Lawson scored three rushing TDs and threw a 66-yard TD pass to WR Jake Bunofsky. Lawson has rushed for 130 yards through three games.Central Catholic won a non-conference game at Hempfield last Friday, 42-14. ... QB Troy Fisher has passed for 437 yards this season and rushed for 176 while accounting for 10 total TDs.The Vikings have defeated Seneca Valley five straight times, including last season in the regular season (42-14) and in the WPIAL Class 6A title game (42-7).Keystone (1-2)at Moniteau (2-1)7 p.m. FridayMoniteau answered the call last week.After suffering what could have been a season-altering loss to Punxsutawney, the Warriors answered with a solid 18-8 home win over Union/A-C Valley.There were many heros in that game for Moniteau.Manny McLean scampered 75 yards for a touchdown that gave the Warriors some breathing room. Cody Wise rushed for 90 tough yards between the tackles and quarterback Chance Nagy hit some key passes in the victory.Now the Warriors are looking for a 3-1 start.Keystone stands in their way.The Panthers, who are coming off a 61-6 loss to Clarion, have a fairly balanced offense led by quarterback Nate Wingard, who has thrown for 559 yards and six touchdowns.His preferred target has been Corey Rapp, who has 17 receptions for 300 yards.Keystone has struggled to run the ball at times this season, averaging 3.2 yards per carry. Rapp is also the leading rusher with 133 yards on 22 carries.Moniteau beat Keystone 33-6 last season and leads the all-time series 29-19-3.CWNC (2-2, 2-0)at New Brighton (0-4, 0-3)7 p.m., FridayCWNC fell 52-28 last week in a non-conference meeting with Central Valley.Sophomore QB Zach Rocco has had a strong start to the season, throwing for 796 yards with 11 TDs and five INTs. ... His favorite target is junior RB/WR Cameron Branch, who has 21 catches for 223 yards. ... In two Midwestern Conference games — against Neshannock and Mohawk — the Trojans have outscored their opponents by a combined score of 52-31.New Brighton dropped a 49-21 conference decision at Neshannock last week. ... After making the playoffs in 2015, the Lions fell to 2-7 last season.Oil City (1-3, 0-2)at Grove City (4-0, 3-0)7 p.m., FridayGrove City keeps on rolling behind a diversified offense and a staunch defense.Trey Adams has picked up where he left off last season when he was one of the best bruising running backs in the area.Now a senior, Adams has rushed for 360 yards and a Butler County area leading 10 touchdowns.Adams is the early leader to claim the Butler Eagle Scoring Trophy with 62 points.Logan Lutz continues to do it all for the Eagles as well. He leads the team in rushing yards (401) and has also hauled in 11 passes for 125 yards.Carter Chinn leads Grove City with 12 receptions for 165 yards.Junior quarterback Brady Callahan has been extremely efficient in the passing game, completing 79.6 percent of his passes for 513 yards. Strangely, he has yet to throw a touchdown pass.The Eagles' defense also hasn't been too shabby, surrendering a mere 27 points in four games and have held their opponents to just 37 rushing yards all season.Junior Tyler Greer leads the team with 31 tackles.Oil City has lost three straight since a season-opening win.Christian Cole is the workhorse for the Oilers. He had 50 carries in a loss to Conneaut and has gained 780 yards this season on 119 attempts.Shady Side Academy (2-1) at Freeport (2-1)7 p.m., FridayThe host Yellowjackets have yet to be involved in a close game in the fourth quarter this season, defeating Yough (43-6) and Deer Lakes (31-0) before losing a 50-0 decision at Aliquippa last week.Freeport and Shady Side have split their last 19 meetings. The Yellowjackets hold a 13-10 edge in the series, including a 40-23 win last year. QB Austin Romanchak has rushed for 262 yards and 4 TDs, RB Conor Selinger 164 yards and 2 TDs.Shady Side is coming off a 38-14 win over Apollo-Ridge as QB Skyy Moore ran for 196 yards and three touchdowns.OLSH (2-2, 1-1) at Summit Academy (1-2, 1-2)12:30 p.m., SaturdaySummit Academy earned its first win last Saturday, a 44-6 decision over Cornell. ... Senior WR Antonio White continued to make big plays for the Knights by scoring three TDs — a 66-yard touchdown catch from Delano Brown, a 10-yard run and a 67-yard INT return.Our Lady of the Sacred Heart also scored a lopsided win last week, beating Western Beaver, 41-6. ... QB Tyler Bradley has thrown 11 TD passes compared to just three INTs. ... The Chargers feature three players with at least 200 yards receiving, led by Richard Banks (26-343-7).OLSH defeated Summit Academy last season, 42-0.St. Marys (0-3)at Union/A-C Valley (0-4)7 p.m., FridayFoxburgUnion/A-C Valley fell 18-8 in a KSAC crossover game at Moniteau last week. ... Senior QB Lucas Bowser has thrown for 451 yards with five TDs and five INTs. ... RBs Jeff Ginn (three TDs) and Greg Duncan (391 yards) lead the team's ground attack. ... Nolan Cumberland paces Union/ACV in receptions with 11 for 145 yards and two TDs.St. Marys remained winless last week, falling to Karns City, 61-6. ... The Dutch have scored just 12 points in three games, with senior RB Tim Beimel leading the team with 129 rushing yards and one score.St. Marys defeated Union/A-C Valley last year, 32-14.