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Fictitious forces

  1. Mar 5, 2015 #1
    Let's say there is a cart with a pendulum inside it. The cart then starts accelerating, while an observer on the ground remain still. I was told that the observer, standing still, would not observe any fictitious forces on the pendulum, so how does he explain the pendulum swinging backwards?
  2. jcsd
  3. Mar 5, 2015 #2


    Staff: Mentor

    The pendulum doesn't swing backwards for him. It accelerates forwards a little slower than the cart does.
    Last edited: Mar 5, 2015
  4. Mar 5, 2015 #3


    User Avatar
    Science Advisor

    The term "observer" refers to a frame of reference. In a ground fixed coordinate system the pendulum never moves backwards.
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