[Vật lý 11,12] Con Lắc Đơn Đặt Trong Thang Máy (Chủ đề 4 - Phần 1)

Hello everyone, now let's go to a fourth theme, that is, in the case of a single layer that is placed in the elevator, how will the cycle of the single layer change with other related geographies? If the single layer is placed in the elevator, then the elevator goes up, then it has two cases, it goes up, but it goes up slowly and evenly, and when the elevator goes down, it can go down quickly and evenly, and it goes down slowly and evenly. So we have to pay attention to problems like this, pay attention to points, these points are very important, so everyone knows that when the elevator goes up, it goes up quickly and evenly, for example, the elevator that goes up the elevator, the rule is that the elevator goes up quickly and evenly, the elevator that goes up quickly and evenly, for example, the elevator that goes up and it goes up quickly and evenly, it means that A and V are in the same direction, so the A class is spinning up, the A class is spinning up, of course, the momentum is spinning, the momentum is always going down with the center. Now the A class is spinning up, then the momentum has to go down because the momentum is always opposite to the speed, so the momentum is written as F, it will go down and so the B that is attached to this F, it turns out that I named it B, it is by B attached to F, so we have B is equal to M, B is equal to B, B is equal to M, and F is equal to M, but in this case, A is in the absolute value, so I try it all, then I have G, it's equal to G, it's equal to G, it's equal to G, it's the case that the elevator goes up quickly and evenly, the elevator goes up quickly and evenly, so we have G, it's equal to G, it's equal to G, it's equal to A, and if the elevator goes up, it's going to go up slowly and evenly, why do you know that if it goes up slowly and evenly, slowly and evenly, then the speed and the speed are opposite, so the elevator is going up, the elevator is going up, then the speed it turns down because in this case it is slowly and evenly, but the speed goes down, then the momentum goes up, the momentum goes up, but the momentum is opposite to the momentum, then we have G, it's equal to G, in the case of the elevator going up, but it's slow and evenly, then you can have G, it's equal to G, except for A, here A is written as the absolute value, so it's sure that the third case is the case that it goes down slowly and evenly, it goes down quickly and evenly, I follow you go down, go down quickly and evenly, which is A and V together, so A also goes down A A also goes down, A goes down, then the momentum, its direction is up, the momentum is up and the momentum is up and the momentum is up and it turns down, then the speed but it's by g from the school to the school so I'm going to replace this with a machine to go down and quickly quickly r my now go down and slow down so slow down so go down go down but go up now go up go down fast now go down slow down go down slow down slow down see this go down but slow down when the elevator goes down then the gear is reversed when the gear is reversed then the analog is like this when this is like this then you see that it also has the same B and analog like that, you can see that it's clear that it's going down slowly and steadily, it's like going up slowly and steadily, so I remember like this, it's like going down slowly and steadily, it's like going up slowly and steadily, and now we're going to do a calculation that applies this knowledge. So our calculation has the following content a ladder hanging in the elevator when the elevator stands still, its period is 2 seconds when the elevator goes down slowly and steadily with a speed of A and G above 2, then the period is T-fact T-fact, now I will delete this part a little bit, I'll leave this for you to see a little bit, I just delete this side to solve this equation, first of all, I will calculate the content of this equation when the elevator stands still, when the elevator stands still, it means that A is equal to 0 when the elevator stands still, its T is equal to 2 seconds T is equal to 2 seconds when the elevator goes down slowly and steadily, when it goes down and goes down slowly and steadily, with a speed of A, it is equal to G above 2, then its period is T-fact , how much is our topic, it's very simple, so I will solve this problem, so let's say this is the elevator, this is the elevator, this elevator is going down fast, it's going down, but it's fast, it's fast, it means that A and B are in the same direction, if it goes down, it goes down, but if it goes down, then the F equation goes up, it goes up, it goes down, then it goes up, and you get that B is always going down to that point, so you can see that B and F equations are opposite. So, the G-fact has to be equal to G A