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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.
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