Hey just quickly, do you guys know of any little pointers to remember for mechanics, i think it occurs mostly in conical pendulum. What i mean is for e.g. when N=0 the particle is no longer touching the surface and also if w^2>0 then the particle is moving. Does anybody know anything else to keep an eye out for?
0≤θ<π/2 if you do it correctly. (If the angle is 0 then obviously you're at rest though, and that's basically the same thing as saying ω
2=0 so you usually don't get that happening.)
You can't have a conical pendulum that goes inverted just by itself.
Maximal tension a string can cope with is something but you're usually guided as to how to approach this type of question.
And of course in general: string means tension, surface means normal reaction (and friction if appropriate - smooth surface implies no friction).
That's basically all off the top of my head I reckon.