Can a motorbike out brake a car?

[moT]

MY GOD this is such a stupid thread how can we expect to answer a question like that there is no specifics.. What type of car? what type of motorcycle? a gp bike will out brake a mini and a porche will out brake a harley!!! if you are talking about bikes and cars in general you will have to find the average braking distance for every type of car and motorcycle and then compare! this is a stupid and irrelevent thread ask a more specific question.

[FJRider]

If you are confident in being able to out brake a car, tail gate them... no worries. IF NOT... BACK OFF a bit. Your choice.

[Mikkel]

Damn, I've been out of the loop at the wrong time...

Considerations of modern vehicle braking are not resolvable by classical physics. The forces are more complex than simple frictional mechanics.

Considering the general behaviour of motorvehicles we can neglect both quantum physical and relativistic effects - as such classical mechanics will describe the situation fully and adequately.

Where you went wrong....
First and formost you tried to qualify your staement with a barrage of pant dropping, "I know this and everyone else is too dumb to grasp the concept"

For where I am sitting that was an attempt for credibility. Unfortunately, it doesnt work.

Then there is the whole point that cars CAN outbrake bikes. If you want to dig up all sorts of theroys that "prove" (remembering that nothing is proved on theroy) then by all means, go ahead. But you cant qualify a theroy with "I would explain it but there is no point because everyone else is too dumb to understand it".

It will not change the fact that cars stop faster than bikes.

No, you are wrong. My pants dropping wasn't an attempt at ridiculing anyone else. I only tried to convey a bit of the frustration that derives from trying to explain something and being met with a "I don't fucking care about what makes sense, wanker!" There is a difference...

Enjoy drinking beer do ya?

Seemed to like mine when you nicked it from the kendogs fidge....

wonk wonk Im so smart blah blah blah blah.

I will also admit that I dont understand alot, my earlier posts show as much but I really hate when people get all righteous about what they do know... alot of People WONT listen to you at all if they think you are a condecending prick, bear that in mind when you frustrated that know one wants to hear what you have to say!


Also it IS a standard beetle in all but the tyres and motor, standand tyres on the front and fats on the back, motor is slightly modifed using standard parts, they came out with faster motors than the one in mine tho.
Power aint going to make a difference to my little brake test that I want to perform out of personal interest and not to prove some silly point.

Mate, if that is indeed the case I can only say I am sorry and would have hoped that you had sent a PM a while back instead of holding a grudge. It certainly was never my intention to filch you beers... (I'll send you a PM followng this.)

Regarding the beetle - my only point was that the tyre sizes sounded a bit off for a 1969 model. Also - did the beetle of that year indeed have disc brakes on the front?

Question - A truck and a scooter, both are moving in the same
direction with same velocity. Which vehicle will come to rest first
when the brakes are applied simultaneously?
-----------------
Soman P.,
In an IDEAL situation, provided both vehicles had the same coefficient of friction between
wheels and ground, both would stop in the same length of time. If the truck were 1000 times
the mass of the scooter, the truck would have 1000 times the momentum and 1000 times the
braking force. For constant force, (momentum change)=(force)x(time). The same time works
for both situations.

In a REAL situation, the truck takes much longer to stop. This is because the truck's brakes
cannot exert enough force to keep the wheels from turning. For a scooter, the brakes freeze
the wheels in place. The scooter slides to a halt. For a truck, the brakes only slow the
wheels down. There are several reasons for this. First, the force produced by locking the
brakes in place would damage both the axles and the wheels enough to be dangerous. Second,
the wheels would stop the truck but not the load in the trailer. The material would continue
moving forward, crashing into the front panel of the trailer and possibly breaking through.
This too would be very dangerous. Large trucks and semis are designed to stop slowly.

Dr. Ken Mellendorf
Physics Professor
Illinois Central College
================================================== ===

From:http://www.newton.dep.anl.gov/askasc...0/phy00754.htm

I'm getting a bit curious - where is the difference between what you are quoting and what I said earlier in this thread?

[scracha]

If you are confident in being able to out brake a car, tail gate them... no worries. IF NOT... BACK OFF a bit. Your choice.

Doesn't matter whether you can out-brake them. If you're up their arse you'll smack into the back of them before you've even thought about grabbing a handful of brake lever.

[Mike748]

Doesn't matter whether you can out-brake them. If you're up their arse you'll smack into the back of them before you've even thought about grabbing a handful of brake lever.

+1


(anticipates thread shift to swerving and bike position on the road)

[imdying]

Ques. Do I have stay more than 10 car lengths behind a van/car at say 100kmh , can I safely stop in time?

The real question.

2 second gap, 4 in the wet.

The real answer.

Whilst it has been a lovely thread, really, this is all the OP needs to know. You follow too close, have a nana moment, suddenly someone else is wiping your arse for the next 50 years. Play safe kids

[imdying]

Doesn't matter whether you can out-brake them. If you're up their arse you'll smack into the back of them before you've even thought about grabbing a handful of brake lever.

Yep, always remember to multiply the 2 second rules by the number of handles you had at the last pub

[Biggles2000]

The only thing a typical bike can do better than a average car is accelerate. Your average performance car will on the other hand brake later, corner harder and get the power on faster than any performance bike. The only advantage the bike has is better power to weight ratio. Keep in mind also that the bike has a much higher centre of gravity so it pulls wheelies and stopies which can be a performance limiting factor espcially at relativaly slow speeds.
As far as tyres go, top end sports bike and performance car road tyres seem to last about as long as each other.

[Gixxer peter]

2 second gap, 4 in the wet.???

Hmm... I always wonder why we need to double the gap in the wet??
Surely the vehicle in front of you and behind you are also influenced by the the wet road and will take a longer time to come to a stop, so wont the gap between vehicles be unchanged??

Maybe a problem if the vehicle in front comes to a sudden stop due to crashing in to a statioary object, but other than that???

[Drew]

2 second gap, 4 in the wet.???

Hmm... I always wonder why we need to double the gap in the wet??
Surely the vehicle in front of you and behind you are also influenced by the the wet road and will take a longer time to come to a stop, so wont the gap between vehicles be unchanged??

Maybe a problem if the vehicle in front comes to a sudden stop due to crashing in to a statioary object, but other than that???

That makes sense, but a car can stop considerably better in the wet than a bike, so increasing following distance can only be the smart bet.

[imdying]

Hmm... I always wonder why we need to double the gap in the wet??

In the dry, you can hammer the crap out of your brakes, and if it locks, no biggy, just let go and reapply (unless you're mike )... I challenge you to have that sort of committment in the wet Smart people leave bigger gaps in the wet...

[cowpoos]

If you never ride on the track or at quick-to-fast pace on the road, I guess braided lines would be a waste of time, though.

modern brake lines are acctually very very good!! good clean brake fluid and quality aftermarket pads..are all anyone on the road and most people on a race track will even need!!

[cowpoos]

The very stickiest bike tyres have been tested at just under 1G braking performance. That is equal to 38 m from 100 kmh.

The main limiting factor with bikes braking is acctually pitching the machine over on its nose [or popping up in to a stoppie if u prefer]...every other circumstance is rider error!!

[cowpoos]

he was taking an exceptionally long distance to stop and when he finally pulled the clutch in the engine RPM shot up - he screwed this up several times. A hard habit to break. They all say they wont do it in an emergency, but we see it so frequently that I really don't believe them.
.

another tip...unless yuou well schooled at slamming down the gears blipping the throttle etc and using the engine to brake aswell...just pull the clutch in at the start of the emergency braking!! saves you having to slow the inertia of the engine aswell...and theres a lot of weight spinning around in a small engine!

[Drew]

another tip...unless yuou well schooled at slamming down the gears blipping the throttle etc and using the engine to brake aswell...just pull the clutch in at the start of the emergency braking!! saves you having to slow the inertia of the engine aswell...and theres a lot of weight spinning around in a small engine!

Most engines crank spins the same way as the wheels I think Poosey, so as it slows it would increase the forward rolling momentum of the bike. Same as the freestylers doin back flips, they leave the ramp with clutch in at low revs, then rev shit out of it to help rotate the bike backwards, and throttle off to steady it for landing. So letting the revs drop as you brake hard would cause the bike to lift the rear more easily.

All this is totally redundant since by the time you complete the checklist for stopping, your spleen has exploded as your sternham hits the head stock.

Apply the brakes, stand up, and brace yourself. Extra points are awarded if onlookers can hear you yell..."I CAN SEE MY HOUSE FROM HERE", before you hit the ground infront of the car you were too close to.