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Three accelerators in a car

  1. Oct 10, 2009 #1
    How many "accelerators" do you have in your car? There are at least 3 controls in the car which can be used to cause the car to accelerate. What are they? What accelerations do they produce?

    I simply do not understand this question...are they talking accelerations within the car, or acceleration OF the car as a whole and even still I don't understand...
     
  2. jcsd
  3. Oct 10, 2009 #2

    mgb_phys

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    Remember that acceleration can be negative
     
  4. Oct 10, 2009 #3
    Ok so the gas pedal in drive and reverse I suppose, but there's still a third? And what does it mean by what type of acceleration?
     
  5. Oct 10, 2009 #4

    mgb_phys

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    Acceleration has a different meaning in physics than everyday
    Acceleration is rate of change of velocity, what does negative accelration mean?
    How else do you change the velocity in a car.
     
  6. Oct 10, 2009 #5
    Ahhh, braking! Right? Negative acceleration just means the velocity is decreasing, so if you go from 0 to 55 mph, then hit the break to stop accelerating to keep at a constant speed, you have negative acceleration?
     
  7. Oct 10, 2009 #6

    mgb_phys

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    Almost, braking is negative acceleration - so if you go from 55mph to 0 in 10seconds you have an aceleration of -5.5mph/s or -2.5m/s^2
     
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