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!

Homework Help: Acceleration: is this accelerating?

  1. Jul 20, 2010 #1
    Which of the following objects is accelerating:

    1. A motorcycle rounds a curve without changing speed.
    2. A helicopter ascending straight upward without speeding up for slowing down.
    3. A person jogging straight south at a constant speed.
    4. A bus starts moving after waiting for a stoplight, traveling in a straight line.
    5. A car speeds up while driving east along a level road.
    6. A car drives at a constant 45mph as it goes over the top of a hill

    What I think as solutions....(correct me please if i'm wrong)

    1. yes 4.yes
    2. no 5.yes
    3. no 6.yes
  2. jcsd
  3. Jul 20, 2010 #2
    For this all you need to know - as I'm sure you do - is that any change in velocity means there is acceleration.

    So yes, each of your answers are correct, in short.
  4. Jul 20, 2010 #3
    those are great questions.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook