Newtonian mechanics - where does the energy come from?
Ok so I am very new to physics and so I apologize in advance for what will probably be a stupid question. I have found that finding the right questions to ask is incredibly difficult but I know I am going wrong somewhere in my thinking by I cannot figure out where. In my experience it's usually right in front of me but for some reason I just cannot see it so let me try to explain what is going round in my head.
I am imagining an object on the floor. If I pick up the object moving it upwards with a constant velocity then a net force must be applied to that object in order to have it go from not being in a state of rest to being in motion. It has accelerated and F(net)=ma. It now has kinetic energy equal to 1/2mv^2. As the object moves upwards (at constant velocity) it gains gravitational potential energy. 927
I am under the impression that the work done on that object is equal to the GPE that it gains as it moves upwards. So if the work done has gone into storing the GPE and they are equal, where did the energy come from which made it accelerate and gain kinetic energy in the first place? It seems as though the energy put into lifting it must be equal to the acceleration caused and thus the kinetic energy gained AND the GPE too. I am also under the impression that the kinetic energy and GPE are equal. So it seems as though I have done work on the object and the work done is equal to the sum of K.E and GPE. How is that possible? Surely that way I have gotten out twice the energy that I put in which is clearly nonsense.
Also, if the K.E and GPE are equal, how is it that it can keep moving upwards with a constant velocity and hence a constant K.E and the GPE is increasing?
The more I write and the more I go over this in my head, the more confused I get and the more frustrated I get which just makes it more difficult. Not to mention the headaches!
Again, sorry if this is really stupid and i'm fairly certain that what I have asked here will make little sense but it's the best that I can do with the mess in my head. Even just writing this I have thought of many other apparent problems and contradictions which I can't even begin to formulate into a coherent question.
Any help that anybody can offer will be greatly appreciated.
Thanks. 1023