1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Tangential, Radial Components of Acceleration Quick Question

  1. Feb 14, 2010 #1
    1. The problem statement, all variables and given/known data
    Are you supposed to write directions for the tangential and radial components of acceleration?


    2. Relevant equations



    3. The attempt at a solution
    Because they are components, I'd say no... isn't a component usually written without a vector sign, and therefore no direction?

    The thing is, components DO have direction. Radial acceleration is towards the center of the circle, while tangential is tangent to the circle. Couldn't these values also be positive or negative? If I define a unit vector [tex]\hat{r}[/tex] that points OUTWARDS from the center of circle, wouldn't my radial acceleration be negative?
     
  2. jcsd
  3. Feb 14, 2010 #2

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    The tangential and radial components of an acceleration must have a direction assigned to them, just as components of forces for example must have a direction. Often the direction is indicated as plus or minus, or in or out, or up or down, etc.
     
  4. Feb 14, 2010 #3

    ideasrule

    User Avatar
    Homework Helper

    Who cares? As long as you show your work clearly, it doesn't matter. Just make sure you don't include a vector sign on the acceleration if you don't include a vector sign on its value (e.g. don't write a-arrow=v^2/r; write either a=v^2/r or a-arrow=v^2/r r-hat).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook