Is a proton's movement considered an object of Quantum Mechanics? I had this thought a while ago when we were studying movements of protons in a force field, specifically inside the field of a charged capacitor. The thing is that we used Newton's Second law to find the magnitude of the force exerted to the particle in a specific point. Then I thought "Hey,what the h*ll? Is this possible in a quantum level, isn't it sense-less?" Am I wrong or right? I asked my sister and she told me this has nothing to do with quantum mechanics. My thought is that we have to use Schrodinger's Equation instead of Newton's. Enlighten me please!