Physics Help Forum Mass Between 2 Different Springs

 Equilibrium and Elasticity Equilibrium and Elasticity Physics Help Forum

 Oct 24th 2017, 05:18 PM #1 Junior Member   Join Date: Oct 2017 Posts: 1 Mass Between 2 Different Springs I've attached a photo of the question. I got a), but I think I did b) and c) wrong. All this is supposed to be solved using the Law of Conservation of Energy, no "frequency" or anything... Thanks for any help or point in direction!! Attached Thumbnails
 Oct 25th 2017, 07:09 AM #2 Senior Member   Join Date: Aug 2010 Posts: 373 I find the wording of (a) a little confusing! The work done by force, F, in moving the block from the initial equilibrium point to the new position is, of course, the integral of F dx. But then the words "the block is held at rest" are added. The work done in holding something at rest against any force is 0. As far as (b) is concerned, the force necessary to move the block becomes its total energy which, as long as the "block is held at rest", is all potential energy. When the block moves back to it initial equilibrium point, all that potential energy becomes kinetic energy.

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