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!

Question about Circular Motion

  1. May 18, 2014 #1
    1. The problem statement, all variables and given/known data

    Acceleration is a vector representing the rate of change of velocity. An object moving in a circle at constant speed:

    A. accelerates without changing its velocity
    B. Has constant acceleration
    C. Changes speed but not velocity
    D. Changes velocity but not speed


    2. Relevant equations

    Arad=V2/R


    3. The attempt at a solution

    The answer given in my book is D, which makes sense, but I also don't see how B is wrong. If the object's speed is constant, and radial acceleration is based off the magnitude of velocity (hence changing direction of velocity doesn't affect it), then shouldn't the acceleration also be constant?
     
  2. jcsd
  3. May 18, 2014 #2

    tms

    User Avatar

    Remember that acceleration is a vector; it has a direction.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Question about Circular Motion
Loading...