Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Simple question about velocity/acceleration

  1. Jul 20, 2010 #1
    Can an object be moving when its acceleration is zero?
    -it can for any length in time, correct?

    And can an object be accelerating when its velocity is zero?
    -it can, but only for one moment in time, correct?
     
  2. jcsd
  3. Jul 20, 2010 #2

    PhanthomJay

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Yes and Yes.
     
  4. Jul 20, 2010 #3
    Jay can you look at my two other my recent post about ball acceleration/velocity and velocity of a ball please?
     
  5. Jul 21, 2010 #4
    for 1st question certainly yes..any thing consisting constant velocity has 0 acceleration..

    And for second ques...well....i think its not possible
     
  6. Jul 21, 2010 #5
    I think the 3st question and the second are correct
    the first one when an object moving with constant velocity so it's acceleration is 0
    the second question occurs in many cases for example when an object moving in the +ve x direction and its acceleration is negative so that means it is decelerating at a moment when he object changes direction the velocity will be zero and the acceleration will still constant

    best regards :)
     
  7. Jul 21, 2010 #6
    the second question occurs in
    many cases for example when
    an object moving in the +ve x
    direction and its acceleration is
    negative so that means it is
    decelerating at a moment when
    he object changes direction the
    velocity will be zero and the
    acceleration will still constant
    best regards :)
    how can a decelerating object have a constant acc?
     
  8. Jul 21, 2010 #7
    when it's initial velocity is positive and its acceleration is negative or vies versa.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook