SV acceleration performance question.

I know there are a few on here who have mastered the laws of physics so with that in mind, heres the challenge.
Sv650s k4 40-80mph time (not roll on) as fast as poss
and
what distance would this be done in?

This would really help in a court case where in a statement made by a my friend accelerated from 40-80 and slowed to about 10 in order to take a 90 degree minor turning all in the space of 150m. Getting the info on stopping distances was easy enough (122m) but not the sv figures. Any help or even estimates would be greatly appreciated.

must recheck suvat equations

id say about 5 or 6 seconds... so using



distance traveled= av velocity (80+40/2= 60mph soo about 26 m/s) x time taken

between 130-155m (for 5 and 6 sec ish)

stopping distances in the highway code arnt exactly relevant alot of vehicles can stop in half that. and depending on the road surface this time of year it can be more too. but 40-80 to nearly stop in 150m... not likely..


my maths might be a bit iffy.. and youl have the best chance at this asking a 16 year old doing physics for gcse.. if anyone else can check that might help you, but the rozzer might just say he underestimated the distance and it could have been 350m.. at those speeds its not easy to tell

What's the charge, DWDC?

[Bibio]

Originally Posted by SVMAT

This would really help in a court case where in a statement made by a my friend accelerated from 40-80 and slowed to about 10 in order to take a 90 degree minor turning all in the space of 150m.

did the officer use a calibrated device? if not then its here say and any decent brief will get it thrown out.

Originally Posted by Bibio

did the officer use a calibrated device? if not then its here say and any decent brief will get it thrown out.

Nope, not if the charge is not speeding.

DWDC for instance, all they have to prove is that his standard of driving fell below the standard of a prudent motorist, and witness statements from civilians are sufficient to prove that in court, never mind a statement from a coppr.

I spent a day in court on the hearsay of two witnesses, one of whom had is own agenda and was lying through his teeth. Had the other witness not been an old guy who took swearing on the bible as a very serious undertaking, even though he basically had to incrimiate himself, then I would have been found guilty without a doubt.

lammy i think you've confused acceleration and velocity :S

a = (v-u) / t

to do that question you need more info i would have though...you cant use speed = distance over time because the braking and accelerating arn't going to be linear...as in if you plotted distance against time...the graph wouldn't be a straight line and thereforeeee you cant use simple v = s/t

maybe a time to get from 40 to 80..to work out acceleration. use that to get distance...then you got to know time to get back down to 10 mph for the turn at max banana and from that you can work out distance

:s i think im right....

oh woops...having just re-read what you wrote i think you make more sense now! ....mechanics on monday...fail!

[the_lone_wolf]

Originally Posted by lammypie

id say about 5 or 6 seconds... so using



distance traveled= av velocity (80+40/2= 60mph soo about 26 m/s) x time taken

5-6seconds in top gear perhaps, in the right gear I'd say closer to half that

SV can do 0-60 in under 4s

Won't crunch the numbers as without that time I don't think there's sufficient data to calculate an answer, and it makes a huge difference to the result

But I will say that my gut feeling is that an 150m sounds about right for an SV going 40-80-10mph if someone were "pressing on"

I'm going to hold my foot firmly in front of my lips ready for insertion and say that I think your mate is being a little economical with the truth, perhaps the officer is as well, but all he needs to do is say that in his opinion XYZ and your mate will have a hard time proving otherwise...

[andrewsmith]

Originally Posted by the_lone_wolf

5-6seconds in top gear perhaps, in the right gear I'd say closer to half that

SV can do 0-60 in under 4s

Won't crunch the numbers as without that time I don't think there's sufficient data to calculate an answer, and it makes a huge difference to the result

But I will say that my gut feeling is that an 150m sounds about right for an SV going 40-80-10mph if someone were "pressing on"

I'm going to hold my foot firmly in front of my lips ready for insertion and say that I think your mate is being a little economical with the truth, perhaps the officer is as well, but all he needs to do is say that in his opinion XYZ and your mate will have a hard time proving otherwise...

I'm with TLW its doable but the truth may be economical, from 80mph to 10 the bike will be close to doing a stoppie as that is some braking effort.

[MisterTommyH]

Originally Posted by andrewsmith

I'm with TLW its doable but the truth may be economical, from 80mph to 10 the bike will be close to doing a stoppie as that is some braking effort.

Could be exactly why he's up in court...