0-60 Speed

Replying to: vtxseth (Feb 07, 2008 7:44 am)

Replies to this message:
• vtxseth (Feb 07, 2008 9:34 am)
  • maltb (Feb 07, 2008 10:42 am)
  • tidester (Feb 07, 2008 11:41 am)
    • c_rex (Mar 15, 2008 11:15 pm) and 1 more...
• nxs138 (Feb 07, 2008 10:15 am)
  • maltb (Feb 07, 2008 10:43 am)

Replying to: maltb (Feb 07, 2008 8:45 am)

Replies to this message:
• maltb (Feb 07, 2008 10:42 am)
• tidester (Feb 07, 2008 11:41 am)
  • c_rex (Mar 15, 2008 11:15 pm)
    • tidester (Mar 16, 2008 1:11 pm)

Replying to: maltb (Feb 07, 2008 8:45 am)

Either way, they both accelerate at 9.8 meters/second ^2 when driven off a cliff.
 
I beg to differ: they'll accelerate at 9.81 m/s^2. That extra 0.01 is a huuuuge difference
 
The only difference I could think of between the two wheels might be weight: if the 20" weighs more, it might take more power to turn it?

Replies to this message:
• maltb (Feb 07, 2008 10:43 am)

Replying to: vtxseth (Feb 07, 2008 9:34 am)

Replying to: nxs138 (Feb 07, 2008 10:15 am)

I beg to differ:
 
You aren't differing, just being anal.

Replying to: vtxseth (Feb 07, 2008 9:34 am)

Very funny, especially because I have A physics degree
 
Then you should have realized that your original question was ill-posed!
 
Is the Sport with the 18" wheels quicker or slower than the GT with the 20's?
 
At 60 mph, neither is quicker.
 
tidester, host
SUVs and Smart Shopper

Replies to this message:
• c_rex (Mar 15, 2008 11:15 pm)
  • tidester (Mar 16, 2008 1:11 pm)

just a silly comment, most of the higher-level engineering courses have a passing grade of around 30 out of 100 due to a curve...so how many engineers really know their stuff anyway

Replies to this message:
• 99zoomr (Feb 11, 2008 1:05 pm)

Replying to: kj123 (Feb 11, 2008 9:24 am)

No engineering degree here, but if my slower CX-9 gets to the next red light 2 seconds later than a quicker car, then they'll have to wait at the red light 2 seconds longer than I do...

Replying to: tidester (Feb 07, 2008 11:41 am)

"Then you should have realized that your original question was ill-posed!"
The question was not at all ill-posed, rather- misunderstood.
It is a very physics oriented question to ask for quantitative and measured results. It would take someone who has driven a similarly equipped vehicle with each set of wheels mounted to answer. I'd like to know the answer to this question too!
 
"At 60 mph, neither is quicker."
Not entirely true. If you mean that they travel at the same 'speed' this is accurate. Quicker can also mean 'more agile' or has greater velocity (acceleration (rate of change in speed)). The effects of reducing unsprung weight in rotational mass can have a huge impact on acceleration. This is a performance AND fuel efficiency question. So at 60 mph- which set will get to 80 mph in the least amount of time?
 
I've only got an Accounting/Finance degree but I aced all my college science classes 20 years ago. Doesn't mean I know what I'm talking about now though.

Replies to this message:
• tidester (Mar 16, 2008 1:11 pm)

Replying to: c_rex (Mar 15, 2008 11:15 pm)

The question was not at all ill-posed, rather- misunderstood.
 
Actually, it wasn't misunderstood. It was misstated.
 
The effects of reducing unsprung weight in rotational mass can have a huge impact on acceleration.
 
Quite correct! Additionally, you lose a little mechanical advantage with larger wheels so your acceleration will be reduced.
 
tidester, host
SUVs and Smart Shopper