The drivers have their say on the opening day of action at Suzuka which saw numerous spins and and crashes.
McLaren
Jenson Button: "It's great to be out on the circuit. Throughout the day, we saw a lot of drivers making mistakes, but that's the nature of this place - it's unforgiving. Obviously, we don't like to see accidents like Checo's, but you appreciate that you have to respect this place.
"It's been a relatively good Friday. We found a good balance on the Prime tyre, but still need to do some work with the Option, because we didn't gain too much going from the harder tyre to the softer one.
"Nevertheless, while both compounds are working reasonably well, I believe there's a cooler weather front coming in for tomorrow, so we need to be careful about the direction we take with the set-up to best cope with it.
"Today's news about Maria de Villota is horrendous and tragic. She had been through so much - much more than most people will ever have to go through in their lives - and it's been so tough for her. This is a real shock to the whole Formula 1 'family' and the world of motorsport. My thoughts are with her family at this time."
Sergio Perez: "My accident during FP3 was my error. I was setting the car up for the entry to Spoon, put my right-rear wheel onto the grass, and just lost the back end. At the speed I was travelling, and with relatively little run-off, there wasn't much room to scrub off speed so I went straight into the wall.
"The impact was quite hard, but fortunately I'm fine. The accident meant we didn't get the track time we needed for the high-fuel and Option tyre runs in our programme for the afternoon. But we'll be able to use some of the data generated by Jenson, and our aim for tomorrow has to be to get into Q3.
"I only heard the very bad news about Maria de Villota at the end of the session. It's incredibly sad to learn this news about somebody you know. My thoughts are obviously with Maria and her family during this terrible time."
Lotus
Kimi Raikkonen: "The car felt pretty good today. Of course, there are some areas we can improve but I'm quite happy with the progress we made. I spun in FP2 so we did miss some of the long run laps we would have got this afternoon. I was on a fast run and the wind changed, which can affect the car sometimes. At least we didn't do any damage so the crew won't have any extra work. It's not a big drama as we know the track pretty well. We have a few changes for tomorrow so let's see what happens."
Romain Grosjean: "Finding the right balance to get the car working well around here is quite tricky and the tyres are not making that any easier, so we've got some work to do overnight to make it a little easier to handle. There's definitely some more performance to be found, and it's always better to be near the top of the times even if you've not got things quite right, so we'll see what we can do tomorrow."
Mercedes
Nico Rosberg: "The track here at Suzuka is such great fun to drive and our car was feeling fantastic around it today. We were quite fast over one lap and on the long runs but the important thing is how we manage the tyres as that will be the key to success here. There's a lot of work ahead of us but I'm really looking forward to the rest of the weekend and I hope we can annoy the Red Bulls a little bit."
Lewis Hamilton: "This track is so beautiful to drive, it's fast and flowing, and our car really does feel good here. But it's also a very unforgiving and challenging circuit; you're always on the limit so the trick is to balance and control that limit. I'm happy with where our car is after the first practice sessions today although, of course, we would love to be more competitive.
"We've got some work to do this evening on the tyre management in particular. It's too early to think about what we can achieve but I'm looking forward to a competitive qualifying tomorrow and then we will have to see what we can do in the race."
Sauber
Nico Hulkenberg: "It was a smooth Friday. The weather was fine, and it wasn't raining as was expected. Everything was going according to plan and we were able to go through our programme. We tested different set-ups and compared rear wings, now we need to look at the data to determine which one is better.
"Otherwise it was business as usual understanding the different tyre compounds, with the option looking better on the long runs. Tomorrow Q3 will be the target. It's a challenge and looks to be tight, but, considering how we went today, I think there is still room for us to improve."
Esteban Gutierrez: "It was an interesting day. It's a challenge to get to know the track, but it delivered everything I expected it would. It's a special circuit, with very nice and fast corners and I enjoy driving here a lot. In the morning I focused on learning the track. It's a complicated track to learn and to find the right lines.
"In turns eight and nine especially, there is no margin for mistake, otherwise you kiss the wall. The afternoon was a lot better. We worked on the set up and it went well. We still have a bit of work to do, but I was able to get a good idea and will do everything to translate that into a good result tomorrow."
Force India
Adrian Sutil: "I always enjoy this circuit, but today the car was not so easy to drive. I was suffering with understeer this morning and oversteer in the afternoon, and it's hard to find the balance I feel comfortable with. We need to try and solve those issues tonight to give me confidence going into qualifying."
Paul Di Resta: "The car was quite difficult to drive today, but we've worked hard to try and optimise the balance. After each run, we changed some things and I think we've learned a lot as a result. The long run consistency seems reasonable, but we need to make sure that we can deliver the performance with both the medium and the hard compound."
Williams
Valtteri Bottas: "There are still some balance issues with the car and the strong winds today made it feel more inconsistent. We are struggling to get the most out of the soft tyres when the track conditions are improving, and relative to the other cars I would say that our pace is similar to where we were in Korea.
"Nevertheless I managed to get a good number of laps in today, more than any other driver, so we have a lot of data available to us to try and improve the car's performance and find a few extra tenths ahead of qualifying."
Pastor Maldonado: "It was a frustrating day today as I didn't get the amount of time on track that I would have liked. My FP1 session ended early after a problem with my left-rear tyre, and at the beginning of FP2 I was struggling for grip and lost the back end of the car and went off the circuit which ended my running.
"Tomorrow is another day though and FP3 will give us a chance to improve the set-up based on what we learnt today and get some low fuel running in to optimise our car for qualifying, which will be important as overtaking here can be difficult."
Toro Rosso
Daniel Ricciardo: "I've been hoping to have a Friday like this one for a while now even if, of course, it's the Saturday and Sunday that's important. So I am glad that I was tenth in the morning and seventh this afternoon, which is a good sign for us. It's a complicated circuit and I love it.
"Today, we made progress with each change we made on the car, keeping each modification and then moving further forward. On my long run on Option, it started quite well until I ran into traffic, but in general the pace wasn't looking too bad - definitely a positive Friday for us."
Jean-Eric Vergne: "It was a troublefree Friday and we worked to our usual programme, working on the car set-up and balance. I have to say I am not yet happy with it, mainly having some difficulty with understeer. However, it was an encouraging day. I did long runs on both tyres and although I didn't get a clear picture from the Prime, the Option was good."
