Recent content by apec45

I also see that if i do that: ##N.t = ma.t## with## t ## tangent to the surface, i get ##a*t = 0##

Uhm, i only see that ##N = m . a## (by Newton's second law) and ##f(x, y, z) = 0## (constraint)

Oh okey, i got it! Thank you so much! We don't know where the particule will go (x = y³ or x = -y³). And could you give me a little bit explanation about the link with the gradiant? :) I really don't see the link with that, or maybe it is that : if G(x, y) = 0 is the equation of the surface...

Thanks you for the answer! but i don't understand it very well :( First, I don't see the link between "the gradiant is zero somewhere" and "there is several ways to move the particule somewhere" (I am ok with your example but i don't see the link). Then, i don't know what's the problem to have...

Hi, In my course in analytical mechanics, it is said that for a system of n particles subjected to r constraint equations, it is necessary to impose regularity conditions on the constraint surface defined by G = 0 where G is a function of the position of the position of the particles and time...

Hey, i have several questions about electromagnetism, i hope you will be able to solve these haha : 1) how to define the electric field? i mean without saying E = F/q because a field causes the electric force and not the reverse so we can't use the force yet right? 2) how to snap a capacitor...