PHYSICS || F5C2 AMALI Pressure in Liquid || U-tube or NO U-tube Selangor AMALI HOW?

[00:00:00]Okay, guys, for the upcoming Amali, seems like we have a problem. Okay, why?

[00:00:05]Because right now, from what the information that is being passed down from my students, okay, we are quite sure that there is such thing as a YouTube given as one of the main apparatus. So, here comes the problem, guys. If there is a YouTube, what can we do? So, obviously, the first experiment I would think of is obviously this experiment whereby it is the factors affecting the liquid pressure. Okay.

[00:00:32]So, um when it is a very complicated experiment is as such, okay, I will say most of the time procedures might be given. So, guys, don't spend all your time to memorize the procedure.

[00:00:46]You can read through the procedure, but guys, the first thing that I want you to know, if the experiment is very complicated, if you look at the experiment and you feel that it is very complicated, please my advice is read the procedures carefully, okay? Why? Because sometimes when the experiment is very complicated, right, they might do certain things to simplify it or they will say something that you have to take note. So, always read the procedures carefully and do it properly. Okay, what are the potential problems? Okay, for instance, how are we going to secure the silicon tube? Are we really going to use a thistle funnel?

[00:01:25]So, sometimes some experiment, to make it maybe easier and simpler, how will they use silicon tube? Maybe they will secure it. Maybe they'll think of a way to clip it. How to clip? I don't know.

[00:01:36]Maybe they use the the baju clip. Maybe they'll hang it. Maybe they'll glue it.

[00:01:40]Maybe they'll tape it. So, always try to read how it is because first of all, guys, nobody knows uh what will come out in the exam.

[00:01:48]Nobody knows, all right? So, what you can do is only with one of the main ingredient, which is the proce- the the apparatus of the YouTube, you can try to think of what might come up. So, obviously uh this is the first advice. Number two.

[00:02:03]So, usually in the in the YouTube setting that is, most likely they'll give you two different uh liquid, okay?

[00:02:10]So, one might be a colored liquid, one might be your normal water. I can imagine some of the students who don't really read through it properly will not realize that the colored water is the one that you pour into the YouTube then to investigate the liquid pressure because the purpose of this experiment is that when you push this thistle funnel into the water, pressure actually increases. So, when your pressure increases, it will push the air inside this tube and it will squeeze this liquid colored liquid down so that the liquid on the other side of your YouTube will go up, okay? So, you are going to immerse the thistle funnel into a water. The this thistle funnel can be substituted by using a syringe, okay? Uh I can show you the syringe maybe another one more time or maybe on my Insta. Let me find the syringe for your experiment. Also very special, right? Okay? So, therefore there is potential that they can modify all this stuff, huh?

[00:03:08]So, then now what is the most most most important thing? Okay, uh read your procedure. See where you click your stuff. See which one do you pour to where. Okay, in my opinion, when the experiments they give you when the experiments are difficult, when they give you the procedure, then where is the difficult part? Okay, the calculation or the theory. Okay, so usually maybe they'll ask you what are the variables. So, your variables are very simple.

[00:03:34]So, obviously they will tell you what you need to measure and everything. So, your manipulated variable, your responding variable, your constant variable is pretty much fixed. Okay, then next, taking the reading. Uh this is where it starts to get complicated, guys. Remember, when you take the reading, always check your H value is measured from where. So, now this thing is measured from the top of the liquid.

[00:03:57]So, make sure that okay, your H measured from the top of the liquid. So, you might want to put your meter rule, if you have a meter rule, you have to compare your meter rule, check like that. Okay, so it's easier for you to see the reading. Then after that, so you must see H is from surface from bottom or whatever. I will say 99.9% of the time it will be from surface, but we can't be very sure of that.

[00:04:22]Number two.

[00:04:23]Okay, what about the second reading that people will always make mistake? It's the D. It could be X, it could be H, it could be H2, whatever, doesn't matter.

[00:04:31]But we are measuring the difference in the height of the liquid. Okay? So, means the right hand side and the left hand side, what how much is the difference? So, that will be actually related to the pressure of your liquid.

[00:04:45]Okay? So, this one also very important knowledge. You need to know that you need to calculate this D, which is the liquid pressure.

[00:04:53]Okay, then after that, usually they call you to do reading ready, they will call you to do table. Okay, now before they go into graph, you need to pause a while first, check first.

[00:05:04]Okay, what is the thing that you need to check? What are the knowledge that's involved? Okay. Now guys, let me tell you, when the experiment is give like procedures are all given, usually students will lose mark in all these simple steps like do you know to draw graph?

[00:05:18]Okay, if you know how to draw graph, do you know how to calculate the gradient of the graph? Guys, remember gradient of the graph cannot memorize on you know. Why? Because different maybe they give you different liquid, maybe they give you salt water. So, it will be affected by the density, blah blah blah blah blah. And then gradient got unit or not?

[00:05:38]Got, but must depend on what you draw.

[00:05:41]If this is let's say D {slash} meter, this is H {slash} {slash} meter, then your gradient is basically m / m, so there will be no unit.

[00:05:53]Okay? So, you can see here, if you draw D against H, your gradient will have no unit. Okay, well I'll put everybody say has unit, but because it's coincidentally you take cm cm or m m, so it will come out to be no unit. Unless trick question. They call you to plot a graph. Okay, let's say they give you a plot a graph of H against maybe pressure Pascal. Okay, then this one you will have unit because it is Pascal over meter. Then your unit may be like P A M -1 or or better still, the the proper way, uh I won't teach you how to derive the unit here, all right? You will have kg m -2 s -2.

[00:06:35]Okay, then so so that's the the unit, okay? So, uh but I think most likely it will be D meter meter, cm cm, something like cm cm, okay? Then if let's say they really want you to draw Pascal, how can I turn this distance into Pascal? So, here you have to use the liquid pressure knowledge. So, guys, in order to prepare prepare for this amali, I will advise you to go and read everything liquid pressure, everything what affects liquid pressure, the depth of the liquid, the density of the liquid, the gravitational acceleration.

[00:07:06]So, if my density increases, my pressure will increase. So, what stuff has high density? Let's say mercury, uh let's say sea water. Then what has low density?

[00:07:16]Oil. So, you need to be equipped with all this knowledge to help you to answer the what if. Remember, physics like to ask what if, okay?

[00:07:26]So, you also need to relate to this formula P equals to H rho g. So, guys, this H, uh okay, you want to calculate the pressure, uh so are we going to sub this H value or this D value?

[00:07:40]This H value or this D value? But you see this H, uh so basically if you want to find a pressure difference, we will sub this D value inside. Okay, but of course please use meters. But the question will tell you what to sub.

[00:07:52]So don't think so much, read the question. You don't know which value which which value to use, most likely the question will tell you. But we usually measure this distance as H.

[00:08:00]Okay? So that is your H value. So row is your density, G is your gravitational acceleration. So SI unit are guys remember SI unit for pressure is kgm -1 s -2. Okay, also Pascal.

[00:08:15]Okay, just in case they want you to say in terms of SI unit. So guys I'm preparing all the worst case scenario so that you don't do anything stupid in your amali. Okay? So guys, uh there is a there is a special thing that at the end of this video. Okay? So guys, if this one color A usually the most makan masa one that will consume most of your time is the experiment setup. Okay? So uh be flexible. If you don't see a distal funnel, never mind. If they give you a syringe, you take that. You use also that. Okay, can? So um what else do you are you going to be very worried? Okay, some people ask me teacher, uh what if I am very lost during the experiment? Guys, if you're very lost during the experiment and you're really not sure what you're going to do with it, just raise your hand and ask. Okay, I know a lot of people say teacher, if I raise hand and ask that then later on they will minus my mark.

[00:09:10]I mean so what if they really minus your mark? Because if you don't know how to do you get zero mark. You have nothing you have nothing to minus already. But if let's say you you you just have one small thing to ask. And let's say they really minus your mark. So 15 amali 15 amali marks, you raise up your hand and you ask the teacher this one how ah?

[00:09:25]I minus two marks ah. But at least if you if you do the experiment you can get maybe 10 marks. Minus two marks is still eight marks right? Better than zero again. So guys, don't be too shy on this kind of stuff. Okay? Can?

[00:09:36]So the the difference in height and everything. Be a sign here, it will be depth of liquid. I don't think they will ask. Okay, I mean I'm predicting that it's going to be that liquid. I don't think they will ask the density of the liquid because it's very hard to control. Okay, I don't think it will come out.

[00:09:53]Okay, now let me just give you all a pointer.

[00:09:55]Now, in a KL 2026 young sudahlah pass.

[00:10:01]They came out something like this, but they asked using a water bottle. Okay, now to not bore you with the whole entire thing.

[00:10:11]Okay, I've already prepared a water bottle punya question, which you can see for yourself. So, how they do this experiment? So, they cover, they measure from the hit here, then they measure the distance of the how far the water will will reach lah. Okay, so something maybe like this. Then after that, you have to plot a graph, then you have to do your experiment. So, this one is interesting because they ask you what is your observation, what's the physical quantity measured by the the spurt of water, how do you write inference, what are your variables, hypotheses, a precaution step, how you calculate P equals to H rho G, all right? And then after that, if now replace with salt solution, give reason for your answer. The answer to this is already provided at the back. So, you can do this question. You don't have to do the experiment, but in the process of doing this question, you will learn how to calculate H rho G. You will know what happens when when you replace with salt solution, and how you explain why salt solution. Okay, I don't want to teach the answer. Want you to learn it yourself. Okay?

[00:11:15]Now, there are some students who tell me, "Teacher, will this thing come out or not? Because my school teacher say whole macam ada sikit uh uh difference." The difference is that some say it's form four. Okay, form four maybe it will I mean I mean there's no YouTube here but maybe they will replace this with a YouTube. I don't know. But this is actually not very difficult. So so it's just very simple. You squeeze the piston. So when your volume actually decreases, your pressure actually increases. Okay? So guys, remember for this amali right, okay? Don't go and memorize anything. Don't go and have fun anything. Don't go and like uh memorize all the procedures everything because the more you memorize the procedure, the more fixed you are.

[00:12:02]You will restrict yourself. Okay? Try to gather information. Try to read through or maybe I don't know what to do. You look at the back. You see the graph. Did they tell you the graph must be how?

[00:12:12]Like the graph got pressure or not? The graph got height or not? So I maybe have to measure the height and everything.

[00:12:17]Read through all the questions at the back but never mind. Okay? Then uh last but not least I'm going to put one more experiment at the back. Okay? So you will see that instead of using a thistle funnel, they use a syringe and then you squeeze the syringe to immerse it into the water. So it is exactly the same experiment as this but they modify the thistle funnel.

[00:12:37]Okay? Because if I'm not mistaken right, a thistle funnel is very hard to buy and very hard to get. It's easier to buy a syringe. So there will be modification.

[00:12:45]Okay? Guys, one bold prediction for this time punya amali. One bold prediction now.

[00:12:51]Now, I do not uh eliminate the possibility that some schools and school some different schools might have different amali. Okay, why? Because Selangor has set one set two for their uh trial exam.

[00:13:05]Last time the trend last time is like your school take set one, your school take set two. So maybe the exam question will be different. So guys, uh please be flexible. What if the amali turns out to be different? Then everybody memorize the same thing. So that's one of the bold prediction that I'll do but I uh it's a low chance thing. Okay? So uh feel free to look at the experiment at the end. All right? If you have any questions, drop a comment below.

[00:13:29]Uh Uh preferably on my uh uh bottom part, I will actually reply your message when I'm free. Okay? So, guys, don't stress too much on a Bali. Trust me, essay 40 marks. Study essay better.

[00:13:41]Okay? So, for this video, was advice in the subject.