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)

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

    kuruman

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    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

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    And you are correct in thinking so.
     
  6. Jul 21, 2010 #5
    great, thanks!
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook