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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)

    1. yes 4.yes
    2. no 5.yes
    3. no 6.yes
     
  2. jcsd
  3. Jul 21, 2010 #2

    kuruman

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    Are your answers correct?

    1. yes 4.yes
    2. yes 5.yes
    3. yes 6.yes

    For future reference: Please explain your reasoning for each of your answers. That way, if we see anything wrong with it, we can point it out.
     
  4. Jul 21, 2010 #3
    i put no for 2&3 b.c there are not changing speed or direction
     
  5. Jul 21, 2010 #4

    kuruman

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    And you are correct in thinking so.
     
  6. Jul 21, 2010 #5
    great, thanks!
     
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