- #1
mcaay
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- 0
Homework Statement
I thought that in the situation where mass is attached to the string and put into motion (vertically), energy goes between 1/2 kA^2 and 1/2 mV^2 like here - http://imgur.com/RU4P6UW
However in student's book I saw the table, which said that potential energy of gravity is also changing, which is logical, but I didn't see it included in equations anywhere for above situation.
For example here it isn't included: http://www.acs.psu.edu/drussell/Demos/SHO/mass.html
Homework Equations
Does it mean that 1/2 kA^2 already covers potential energy of gravity? I can't see any other explanation that would work, but I don't understand why would that be, because 1/2 kA^2 is supposed to be potential energy of oscillatory motion, and in horizontal situation equations are the same without any change in potential energy of gravity.
Maybe the equations are incomplete? If that's the case, then how should they look like?
The Attempt at a Solution
(1st link)