Look at it as trying to climb a hill in order to get to the other side of it.
http://wiki.answers.com/Q/What_is_an_analogy_for_a...

Activation energy is the energy that must be overcome in order for a
http://www.chacha.com/question/whatisananalogy...

How to calculate the coordinates of the vertex of a function, using the formula of the vertex V (b/2a ;  ∆/4a) How to calculate the coordinates of the vertex of a function
http://www.enotes.com/documents/howcalculatecoor...
