Skip to main content
Physics

You are not logged in. Your edit will be placed in a queue until it is peer reviewed.

We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

5
  • 5
    $\begingroup$ Everyone please keep in mind that comments are meant only for suggesting improvements or requesting clarifications for their parent post. I've deleted some comments that were not serving those purposes. $\endgroup$
    – David Z
    Commented Dec 6, 2018 at 16:08
  • $\begingroup$ @MasonWheeler - I believe the OP is referring to the wheels of the car (perhaps a good clarification), and what you're talking about is 1) the suspension unloading (as you brake the body of the car shifts forward a tiny bit on the suspension, and when the braking stops, so does that "leaning", and 2) the human body doing something very similar, that can create an illusory sensation of the car moving backward. $\endgroup$
    – zzxyz
    Commented Dec 6, 2018 at 21:09
  • 3
    $\begingroup$ You know that acceleration isn't constant? Is it a surprise that it's no longer negative when it reaches zero? $\endgroup$
    – Beanluc
    Commented Dec 6, 2018 at 22:17
  • $\begingroup$ @Beanluc, that's not quite right though, is it? If you were able to keep the bake pedal depressed to a constant degree, the frictional acceleration would also be constant, and then suddenly drop to zero when the car stops moving. At that point, all the forces in play would be static (or possibly spring-like, as when the car recoils after stopping). That's exactly why this seems a little weird at first! $\endgroup$
    – senderle
    Commented Dec 7, 2018 at 18:13
  • 1
    $\begingroup$ Welcome to the wonderful world of friction science: en.wikipedia.org/wiki/Tribology $\endgroup$
    – JoseOrtiz3
    Commented Dec 10, 2018 at 5:50