Check my science progress?

  • Thread starter Thread starter halfracedrift
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Hi everyone... I'm doing a science project report on comparing cars with FF drivetrain and MR drivetrain.. so..... yeah...

anyways here goes...


On the drag strip, a MR car will win because of weight distribution. What this means is that because of how the weight is distributed on a MR car, it will win. When a car accelerates, there is lateral “g” force exerted on the car, and is proven by Newton’s 3rd law of motion, which states that: The force that object A exerts on object B is the same as the force that object B exerts on object A, but is in the opposite direction. We can prove this law, because when the driver of the car steps down hard on the gas pedal everyone is pushed back into his or her seat. We can also prove the law correct, by having a car that is parked and is still. A person inside the car will again, step down hard on the gas pedal. Notice how the car’s front suspension will be “unloaded”. In other words, weight is shifted to the back wheels. Now that we have proven that this law indeed is correct, we can use it. Working with this law, we can say that MR cars are faster on a drag strip, because when they accelerate (Forward Force), it experiences an equal but opposite force (Backwards Force). When this happens, the front wheels do not have as much traction as the rear wheels. When insufficient grip is on the driving wheels, there is excess power delivered to it. This is called wheel spin, or a “burnout”. When this happens, you will not get anywhere, because the wheels are free rotating in air. However, if there is excessive weight on the driving wheels, it causes more friction to build up on the wheels, and it slows down acceleration. When there is sufficient grip on the wheels it gives maximum acceleration. By sufficient grip, we mean, just enough grip to overcome the friction on the wheels, because too much grip means too much friction, which is what slows us down. This means that a higher speed can be achieved quicker. When a maximum speed is achieved quicker, you can travel longer at the car’s maximum speed, and hence, this would give you a quicker time on a drag strip.



phew..... thats just a part of my science.... comments are EXTREMELY welcome... :D but they should be constructive.... don't say "it sucks" or anything. that won't get me anywhere.. :P
 
Sounds pretty good so far HRD :)
 
Not really, i haven't really done anything like this before, so it looks good. Maybe others will have suggestions.
 
Hmm, just a quick question here, smarty pants, but would a RR car accelerate faster or slower than an MR?

;)
 
ah.. wrong
:P
It depends, does the RR have the same weight as the MR? not just on the wheels, but overall
If it is, is the MR tuned to have perfect weight distribution on the wheels already? If not, how much off is it? there are so many questions.. ><

I'm certain that RR would out accelerate MR given the right conditions, but like I said above, you can tune either of the cars so that give maximum acceleration :D
 
Originally posted by halfracedrift
Hi everyone... I'm doing a science project report on comparing cars with FF drivetrain and MR drivetrain.. so..... yeah...


You'll need examples. Specifically, you'll need cars with near or exactly the same weight and power, but different drivetrains, and you'll need the actual drag numbers from them.

What would be even better is if you could get g-loading and acceleration data in a comparuison on a track. There are many instruments which measure this stuff.

Honestly, just theorizing all of this stuff and explaining it doesn't work. While you can write a paper beginning with that, you'll need some actual evidence to 'prove' it at the end.
 
Well..... i guess...... "runs off to sites to find cars with reqs like that"
thanks b campbell..
i'll keep that in mind.. :p
edit: Specifically... what kinda cars do you think are like this?
cuz i can't think of any right now..... :(
Now i'll prolly have a whole PAGE of credits cuz of way too many html links.. hahah
 
You might want to start with the MR2 or MR-S. They are both fairly light and low-powered, so you should be able to find many FF cars with similar properties. Keep in mind that gear ratios also have a huge effect on straight-line acceleration. If you don't get the info first-ahdn you will wantto look it up using multiple sources for verification.

There are lots of outside factors going on here, though. You'll need to list these. The most important I one I can think of is driver skill, though tire type and size, and tire wear are others. It's really hard to make this kind of comparison and have the results be accurate unless you have the cars readily available and lots of money for parts and equipment.

Good luck!
 
Ykno what.. i WISH i had alot of money.... but.. no.. so.. yeah
besides, this is a grade 9 science fair project... don't expect me to go TOO far... but my most powerful source is the net... muahaha:devil:
man i sound evil don't i..... ><
 
Yeah I was going to ask what level thsi was going to be on/around. Just make sure you have data to back up your claims, is all - pure speculation does no good to anyone.

Give me some time and I'll check your original peice. There are some things that could use clarification.
 
Yep.. which is why I need that proof...
but i also have sir issac newtons laws on my side! muahah! sorry..I'm just really...:nervous: bout this whole thing... i dun wanna fail... >< i mean it counts for 20% of our term mark......
 
in.... well my place its the 25th of december right now... :duh: but its due... feb..... 25-28.. thats when the fair is being held.. although i'm guessing it'll be due like.. a week earlier than that.. so i relaly only have 7 weeks left.. >< "push the panic button!"
 
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