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F=ma of a race car

  1. Oct 24, 2006 #1
    explain the following in f=ma
    a)a racing car has a powerful engine and is made of storng but light weight material

    b)a car with a small engine can still accelerate rapidly

    please help me i need model answers thx soooooo much:biggrin: :cry: :biggrin:
     
  2. jcsd
  3. Oct 24, 2006 #2

    Danger

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    Welcome to PF, Roxas. In any vehicle, your acceleration depends upon 3 factors primarily. One is the power-to-weight ratio, the second is how effectively that power is applied to the road, and the third is aerodynamic drag on the vehicle. For engines built to the same specifications, a bigger one will always have more power than a little one. You will also have better acceleration from a rear-wheel drive or 4-wheel drive than you will from a backwards car because of weight transfer to the drive wheels.
     
  4. Oct 24, 2006 #3
    my homework question says it has to be explained in f=ma, like how am i supposed to do that??:confused: :cry: :confused: :cry: :confused: :cry: :confused: :cry: :confused: :cry: :confused: :cry:
     
  5. Oct 24, 2006 #4

    Danger

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    Well, to start with, homework questions don't belong here. This should be posted in the homework section of the forum. Secondly, I'm a practical guy, not a mathematical one, so I can't answer you in those terms. Third, whining won't help. Good luck with it, though.
     
  6. Oct 24, 2006 #5
    i forgot.....thats why i apologised to the mods in the second post
     
  7. Oct 24, 2006 #6

    Danger

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    No prob. I gotta get back to bed now; I was just up for a midnight snack and the wife has noticed my absence. Catch you later. :smile:
     
  8. Oct 24, 2006 #7
    H3LP ME!!! MY L1F3 SUX I AM 3M0 PL3AS3 TE11 M3 THE AN5W3R T0 THAT QU35T10N PL3AS3 PL3ASE ANIB0DY PLEASE!! . THX =) my exam is next week=(
     
  9. Oct 24, 2006 #8

    rsk

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    OK, in terms of F=ma, acc depends of Force and mass

    a = F/m

    So a big heavy engine which can provide a large driving force, might also have a large mass, which would lmit the acceleration.

    the smaller lighter engine, although it can't provide the same force, doesn't have the mass either so can still produce a reasonable acceleration. It's the ratio between the force and mass you need to think about for acceleration
     
  10. Oct 24, 2006 #9
    edit: my sos message was posted at the same time as yours. thx soo much
     
    Last edited: Oct 24, 2006
  11. Oct 24, 2006 #10

    rsk

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    stop panicking. Read and think.
     
  12. Oct 24, 2006 #11
    edit: oops my com crapped up and i accidentally double posted .
     
  13. Oct 24, 2006 #12

    Danger

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    And please, please don't ever post in whatever that style was again. It's incredibly irritating. Proper English (or as close as one can get to it if it's not his/her first language) is the acceptable form here. This is not a scolding... just pointing something out. :smile:
     
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