Using conservation of energy

[deleted647690]

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I know that with inclined plane problems, it can be easier to use KE = PE to solve for a velocity rather than using trig and using the kinematics formulas. But this doesn't work if there is friction, right? Since some of the energy would be lost

 

[aldol16]

Conservation of energy always applies, but when you have non-conservative forces acting, you must also take them into account. In that case, the work-energy theorem because W = W(conservative) + W(non-conservative) = change in KE.