Bristol slipped to a fourth successive Aviva Premiership defeat as dominant Exeter underlined the huge task facing Andy Robinsons team to secure top-flight survival this season.Try doubles from wing Olly Woodburn and No. 8 Thomas Waldrom -- plus a late Sam Hill touchdown -- meant the Chiefs were always in charge at Ashton Gate, with a second bonus point win in seven days seeing them climb to fourth place.Fly-half Gareth Steenson added five conversions and two penalties for a 41-17 triumph, and although Bristol showed glimpses of quality -- underlined when full-back Jordan Williams, hooker Ross McMillan and substitute Max Crumpton crossed for tries -- they have shipped 164 Premiership points so far in September.And life is not about to get any easier, with league champions Saracens due in the west country next Friday, although rugby director Robinson is realistic enough to know that beating clubs around them in the Premierships bottom third represent Bristols best hope of making progress.Exeter, bottom of the table behind Bristol this time last week, had far too much firepower in terms of ball-carrying threats, while skipper Steenson proved a master of playing the territory game at key moments.Robinson made six changes -- all in the pack -- following last Sundays 70-22 drubbing by Wasps, with prop Kyle Traynor, lock Mark Sorenson and flanker Jon Fisher among those called up to start, while Exeters four switches included a chance for Sam Hill in midfield alongside Henry Slade.And the visitors were immediately into their stride as Bristol endured a miserable start, with wing Tom Varndell going off for a head injury assessment and then slick Chiefs passing allowing Woodburn a clear run to the line, with Steensons conversion making it 7-0 after just four minutes.Bristol responded in determined fashion, though, putting together a number of attacking phases as they looked to make a temporary one-man advantage count after Exeter wing Ian Whitten was sin-binned following an aerial challenge on his opposite number Ryan Edwards.Referee Tom Foley made repeated big screen viewings as he consulted with the television match official Sean Davey, but a yellow card -- rather than red -- was probably the right call.But Exeter were not knocked out of their stride, and a smart break by Hill ended with him delivering a scoring pass for Woodburns second try, again converted by Steenson, as they moved 14 points clear.Bristol had to hit back immediately, and they did so in style when Edwards showed a blistering turn of pace to leave Exeters defence floundering before support runner Williams crossed to claim an outstanding try.But any hope of a concerted Bristol fightback before half-time disappeared as Steenson kicked a penalty before he added the extras to a trademark close-range Waldrom touchdown as Exeter trooped off 24-5 in front.And it took the Chiefs barely two minutes of the second period to claim a bonus-point try after their forwards rumbled relentlessly towards Bristols line and Waldrom applied the finishing touch.Steensons conversion moved Exeter past 30 points, before his second penalty increased the lead, but Bristol continued battling away, and Crumpton added a third try 10 minutes from time that Williams converted from the touchline.As against Northampton 12 days ago, Bristols strong second-half performance offered their supporters hope for the considerable challenges ahead, but one point from a possible 20 so far tells its own story. 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The Northern Irishman arrived at the course on Wednesday hoping to start, but after hitting a few balls on the practice putting green Clarke advised officials he was not fit to play. Sebastian Vettel admits Ferrari is on the back foot following a difficult Friday ahead of the United States Grand Prix.The German lost a small aerodynamic part from underneath the front wing of his Ferrari during the opening practice session and spent a spell in the garage as a result, missing valuable track time. Vettel had a better afternoon session, posting the fourth fastest time, albeit 0.8s off the pace of Nico Rosbergs front-running Mercedes.Well it was a tough day to be fair, Vettel said. I think this morning we had some problem with a little wing that failed and came off and we lost some track time. It was a bit costly for the afternoon because we couldnt really re-balance the car so I think we are a bit on the back-foot today.Not entirely happy with the car balance yet, its a little bit too nervous all around but I think tomorrow we can improve, usually Friday you dont see the full picture. Hopefully tomorrow well be a lot stronger.Vettel ended FP2 0.7s down on Daniel Ricciardos Red Bull but was marginally ahead of Max Verstappen.When asked whether he thinks Ferrari can beat Red Bull in Austin this weekend, he replied: Well I think we have a chance. Today they were very quick, theres no doubt, but then again its Friday so I wouldnt worry too much. We never know what the oothers are doing, I think we know what we were doing.dddddddddddd.As I said we didnt have the best day, but for sure it will be very close and difficult to match them tomorrow with the speed they showed today but I think the Ferrari you saw today is not the Ferrari you will see tomorrow.Despite a tricky day, the four-time world champion -- who won at the Circuit of the Americas in 2013 for Red Bull -- remains confident about Ferraris chances heading into qualifying on Saturday.I think we didnt have the rhythm today for a couple of reasons, some of them I mentioned, some of them I dont want to mention. Tomorrow I think we should be better and if I trust 100 percent the car with some things that I think will be better tomorrow then I think qualifying can be very good and able to hopefully squeeze a bit extra. Surely it will be very close but we will fight.Vettel had to visit the stewards after FP2 for joining the pitlane by not staying to the left of the bollard on entry. The stewards handed him his first reprimand of the season for the incident.Race director Charlie Whiting had instructed drivers to stay to the left of the bollard when entering the pits. ' ' '