1. Not finding help here? Sign up for a free 30min 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!

Conceptual Spring Problem

  1. Jan 5, 2010 #1
    1. The problem statement, all variables and given/known data
    A spring (in equilibrium) is attached to the top of a box that is moving at a constant speed vertically upward.
    However, if the box stops, does the spring go upward or downward?

    2. Relevant equations



    3. The attempt at a solution

    The spring goes downward because originally, the force being exerted on the spring is the spring force and gravity. But, when the box is stopping, there must be an extra downward force to slow the box down, so once the box stops, there will be a net downward force.

    Logically, I would imagine the spring going upward but...

    The answer is that the spring will go downwards. Is this the correct reasoning?

    All replies are much appreciated.

    EDIT: Sorry if I wasn't clear enough before, but the spring is inside the box and is hanging from the top of the box.
     
    Last edited: Jan 5, 2010
  2. jcsd
  3. Jan 6, 2010 #2

    ideasrule

    User Avatar
    Homework Helper

    That's true, but a net downward force means a downward acceleration. It doesn't mean a downward speed.

    That's correct. The spring initially keeps whatever speed it had before the box stopped, so it's still going upward when the box stops.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Conceptual Spring Problem
  1. Conceptual Problems (Replies: 5)

Loading...