#PZ222@ProfZirul Turns out the Gaussian surface that we've been talking about is kind of like the "qualification" to indicate whether a charged object has symmetry in the charge distribution or not. If it has, then we can apply Gauss' Law, but if not, then we can't apply the law
#PZ222@ProfZirul But after watching the video, I now understand what it's about, which is about the electric flux of an object with its charges evenly distributed. The video also cleared the abstraction with the symmetry thing.
#PZ222@ProfZirul https://t.co/LYPp9hpcPz I really like this video! I have to be honest, before watching this video, my understanding about Gauss' Law was still not clear. I couldn't even remember what it was really about. (1/2)
#PZ222@ProfZirul This is an example of static electricity. Because I combed my hair a bunch of times, the comb slowly started to gain negative charges from my hair and thus became negatively charged. So when I took a neutral piece of paper near it, it got attracted to the comb.
@ProfZirul#PZ222 https://t.co/BWhKoaFJMQ This video is my favorite because it explains to me about the concept of space-time (I was still confused with the book's explanation) and how it is possible to mathematically prove the empirical data that the speed of light is constant.
@ProfZirul@ProfZirul#PZ221 This is an example of work. The binder’s kinetic energy is initially 0 but after I give some force, the binder now has some kinetic energy. The point of application where I exert my force is also moving, which proves even further that this is work.
@ProfZirul@ProfZirul#PZ221 But some kinetic energy is lost when the pencil hits the table (converted into sound energy). The converted kinetic energy indicates the existence of Kconv (Kconv is not 0), while the remaining kinetic energy in the final condition indicates the existence of Kcm
@ProfZirul@ProfZirul#PZ221 The initial kinetic energy of my mechanical pencil is partially converted into potential energy (because it’s moving at a certain height), while the rest of the kinetic energy is in the final movement of both objects. (2/3)
@ProfZirul@ProfZirul#PZ221 This is an example of an impulse. The pencil’s momentum is initially zero (it’s not moving), but because of the impulse that I gave, the pencil no longer has zero momentum. The system that contains just the pencil is no longer a closed system because of impulse.
#PZ221@ProfZirul This is the proof of constant acceleration caused by gravity. Even though my journal’s way heavier than my earphone, they still fall at the same time because they accelerated at the same rate. The acceleration comes from gravity that “pulls things down”.