GCSE Physics - Static Electricity #24

[@Cognitoedu]

If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it's totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

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I have trouble staying focus in class and this really helps when I am learning this stuff in class and then I forgot it sometimes, so thank you so much :)

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how did it went

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very helpful, thank you i have a physics mock tomorrow and this explained the topic very well :)

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same

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This was really helpful, thank you! I'm a Swedish student in year 8 and I have a very hard time learning anything that my Russian teacher is trying to teach, she can't even speak the language completely and she tells me to ask other teachers for help. BIHHHH I came here to learn from you like gosh!

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[@armstrongtixid6873]

Hey, I'm also in Y8!

[@armstrongtixid6873]

@Elin Fryding Månsson Some topics, like Static Electricity, are often recurring topics in school. You learn them at a relatively young age, and keep revisiting them in more depth. Good luck learning!

[@there7563]

I have never understood static electricity until after watching your video, thanks a lot

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thank you for these im homeschooled and rlly need these for science (of course i use workbooks and such, but they dont give me the rundown on how these kinds of things work so i have to rely on youtube and online media)

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me too

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I am also having a exam on static and dynamic electricy he helped me alot

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[@Cognitoedu]

Thanks Hassan, glad to hear you're finding them helpful 😊

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this is saving meee, i have a test with static electricity questions tomorrow

[@fazilaazwar9736]

If electric shock occurs as you mentioned in the case of touching the cars, is it life-threatening or a simple one?

[@Cognitoedu]

Normally it's just a simple non-harmful one :)

[@fazilaazwar9736]

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Fazila Azwar proceeds to his car

[@Yimika777]

i mean have u even died from getting a shock from a car

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[@IyanahsTeachingCorner]

Static electricity, also known as electrostatics, is the buildup of an electric charge on the surface of an object. This charge can be positive or negative and occurs when atoms gain or lose electrons. Here are some examples of static electricity: Walking across a rug When you walk across a rug, your shoes rub against the carpet and collect extra electrons, giving you a shock when you touch a metal surface. Rubbing a balloon on a sweater Rubbing a balloon on a sweater transfers electrons from the sweater to the balloon, giving the balloon a negative charge. Removing a hat When you remove your hat, electrons are transferred from the hat to your hair. Static electricity can cause sparks, electric shocks, and other effects. For example, a static charge can build up in liquids or gases pumped through hoses or pipelines, which can be dangerous if the materials are flammable. To reduce static electricity, you can try: Using a static-reducing spray Using a damp cloth Using a wire hanger Moisturizing your skin Increasing the humidity in your home Separating your clothing Air drying your clothing Using fabric softeners

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[@t.a.n.g.o7353]

thank you so much, I have my exam tomorrow and this really helped

[@nstar3489]

Very useful. Thank You!

[@Cognitoedu]

Ah thank you for the comment Shining! Glad it was useful :))

[@janakabandara6425]

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[@nikhilkanade3871]

1:11 Hey, great video, just has a question, how are we supposed to know what lost the electrons, as in, like the example between a cloth and a plastic rod, we know the cloth became positively charged due to the loss of electrons, how are we supposed to identify that, something like the hat and a bag so basically which is going to be positively charged and which one will be negatively charged and why?

[@chair8401]

It really depends on the materials of the object

[@nikhilkanade3871]

@@chair8401 could you please explain a bit more?

[@chair8401]

@@nikhilkanade3871 The thing I’m saying is that certain materials will have their electrons rubbed off, and then build on another material, such as for instance if we have a plastic rod and cloth, the friction between both materials will cause the cloth to have their electrons rubbed off, to then build up on the plastic rod. The plastic rod will be negative and the cloth will be positive. Hope this helps

[@chair8401]

If you want to how which materials have their electrons rubbed off, then you should consult google.

[@nikhilkanade3871]

@@chair8401 ohh so basically fixed items have fixed charges like the plastic rod and cloth, when it gets rubbed the rod will always be negative and the cloth always positive right?

[@rashidasaleem2421]

I am having my sci exam tomorrow. This really helped a lot. Thankyousm.

[@seriousnesstv7902]

Anyone else here because their teacher made them watch this video? Maybe Ms. Sansing or Mr. Cruz???

[@applegrey]

yeah

[@mikewazowskigaming3029]

No

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Yeah my teacher she just loves doing fashion

[@someone...000]

Hi cognito, i dont understand the bit about the metals, as in why charge does not build up on them, pls explain, waht do you mean they just flow back???

[@areebputra855]

Notes Sparks appear when discharged *Most Materials are neutral *When items are rubbed it creates electrons to be off one of them *Electrons moves in metals *Electrons can’t flow in insulating materials *Only negative electrons are getting transferred

[@linasaadani636]

Thank you for the video! It really cleared some things up. I just have one question. In my text book it said to discharge a charged conductor, you should earth it, as this would cause the electrons to flow back into the ground or back up (depending on its charge). 1) Does this work for insulators? 2) You said in your video that conductors don't get a build up of charge. So why is this question asking me how to get rid of a build up of charge? And why do we need to earth it if, according to your video, the electrons just flow straight back to the conductor??? Please reply!

[@Cognitoedu]

Hi Lina, - thanks for the comment! You can earth insulators and conductors to discharge them. You're right that conductors generally don't get a build up of charge, but they can occasionally - if you watch the video from 2:40 we talk about how charge can build up on some conductors, for example cars. This is because the metal frame of the car (which is a conductor) is connected to the ground by tyres (which are insulators), so the charge from the car can't pass to the ground. By earthing it, the charge would then flow to the ground and dissipate. I hope this helps with your question?

[@linasaadani636]

@@Cognitoedu Yes, this DEFINITELY helps! Thank you so much for the quick response!

[@shamsvip9346]

Lol

[@musicvenom3816]

Best educational video on KZbin about static electricity! *But i have one question* I have a possitive charged material, and the material touch the conductor. Electrons from conductor go straight to the possitive material? And also if i have a negative charged material, and the material touch a counductor. The electrons from material go straight to the conducotr right? I have seen a video about walking on a carpet, and the body give electrons to the carpet. And when body touched conductor, he got schock. And then again similiar video but then the carpet give electrons to the body. So there are to possibilities how to discharged the positive or negative material. Connect that to the ground. OR touch the conductor right?

[@musicvenom3816]

@S thank u

[@Zachdeadpool]

I'm doin this for "school" as of c-virus

[@Siyona5511]

me too!

[@yodad751]

Same

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Lmao same it’s a quiz I have to do so wish me luck even tho I don’t need it

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[@jaysant6958]

2:07 When you say that the charge increases, you mean the negative charge increases more and more right? Charges can increase in the negative way by accumulating electrons too?

[@basanttarik1561]

1_ How does the door's knop still neutral after giving electrons to the man? 2- Does the carpet lose the extra electrons to another positively charged object or not ?

[@JoshuaTurley]

Casually have the GCSE in 50 minutes

[@Ahltyyy]

please help me to fix this confusion, free science lessons said the plastic rod would become positive charged and the rod would become negatively charged, but u said the polythene rod becomes negatively charged, so which one is correct?

[@Cognitoedu]

Hi Alty, it depends on what material the rod is being rubbed on. What material is being used in the freesciencelessons example?

[@manonthemoon34]

great explanation, thank you. what kind of bonds can allow for this exchange? what molecular structures localize charge rather than dispersing them?

[@FactFlix3]

metallic/ionic

[@divinemoon2101]

So useful❤ very much appreciated thanks.

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MY EXAMS ARE IN 2 HOURS HELP

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Considering that this comment is a year old There is nothing we can do *cue sad napoleon music*

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​@@raedchehayeb2468 mine is in a week help

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[@HassanIsmail-yh1jy]

Amazing explanation!!

[@Riial_007]

For metals, how do the electrons flow back?

[@danila.5181]

It’s the same as for any material, they just need to be in contact with anything that is conductive like a different metal, a person touching it etc. It only remains charged if it doesn’t have any conductors nearby

[@danila.5181]

I said ‘nearby’ instead of ‘in contact with’ because if the p.d. Is large enough the electrons could jump across the gap i guess

[@kashifjaved-4276]

Well explained, excellent video, very helpful 👏

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This helped me a lot for my q and A’s

[@Jasonbabee]

This video is the best video about Static electricity no competition

[@mohammadghandouri9374]

very good explanaition clear to the point thank,s

[@yesitsme2143]

Hey i have a question, if most materials are neutral, then does that mean that in charge transfer, the electrons in the material are more than protons?

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Bro you saved my future god bless you

[@marvinlee7657]

Can I ask a embarrassing question? From chemistry, if particles are unstable, won't they combine with other particles, and then the electrons will be locked with each other? Even if the number of unstabilized particles is limited, Then why does friction displace electrons indefinitely? Quantum mechanics seems to be able to explain it, but what if it is not explained by quantum mechanics?

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Do we need to know which materials recieve or give electrons

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Thanks COGNITO you help for my semester exam, but I have a question. How do we know where the electrons are going to go?

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Today 😢