Contact mode force curve : To check the deflection of cantilever. There are many kinds of force make tip deflection. Depend on what kind of force you want to measure. Friendly speaking, in order to know the whole tip deflection circule, you will use maybe too much force and make tip break.
Tapping mode Force curve : To check the amplitude change with different height. To move tip closer to surface will make cantilever amplitude much smaller than original free amplitude.It also possible to make tip break.
For biotechnology application, we need very small spring constant to measure strench force...In reqular application, no so many appplication need to use force curve.
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