Moments, Torque, Toppling & Couples - GCSE & A-level Physics (full version)

scienceshorts.net Please don't forget to leave a like if you found this helpful!
Leave a comment suggesting what I can cover next.
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00:00 Moment equation & principle of moments
03:10 Taking moments around points
07:25 Forces at angles
12:01 Toppling
12:48 Couples -
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[@mse5842]

Perfectly balanced, as all things should be

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lmaaoo

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I see that avengers reference

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i legit watch like 20 videos, waste my time dont understand annything but then I come and watch a 10 min video of yours and i understand everything tysm please upload more videos.

[@ScienceShorts]

Thank you!

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[@spar5171]

@@ScienceShorts the only question I have is where does the perpendicular distance to the line of action come in? Since you only drew it on but never used it.

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always come here to get a subject properly explained after my teacher mucks it up

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Phillip Banks not wrong there chief, same here

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FIRST THINGS FIRST RIP UNCLE PHIL

[@urano4810]

Swear. My professor spent half the class one time trying to explain centroids and he couldn't figure out why his numbers weren't adding up. He confused me even more that day, it was discouraging.

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These videos got me an A for my AS Physics. Thanks a lot Sir

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What you got in a level?

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@@zohaibgulawan9070 they might not have done A-Level

[@goldielocks9092]

I seriously can not believe that after 3 years I finally get moments. I honestly feel like crying right now 😂 Thank you! Thank you so much!!!

[@veeistiredasf]

I'm so thankful for this channel, without it, I would be failing my physics 😩

[@georgekomath8978]

Mate, thanks so much. I just spent 40 mins trying to understand moments using a textbook and my notes from school and I couldn't understand a thing. Your video just solved all my questions in 5 mins and 50 seconds

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Just discovered this channel by KZbin algorithm and it's been helping me a lot with ENEM down here in Brazil. Cheers

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I got what i wanted in the first 10 seconds 😳😳🤣 Thank so much

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this guy is better than any teacher you can have. had a 2 hour lesson on this and learnt more in the first 3 minutes

[@lilessy2262]

Bro ur a legend I have a physics test tomorrow an I can actually do well now. God bless

[@abhishekvijay2982]

Thank you so much, you are such a life saver, again like many of the viewers, I too came here after my teacher spent the entire class confusing the hell out of all of us.

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Phew! Thanks man! Great video! I had watched the video once and I forgot this channel name! Glad I had liked the video and found it again!

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These videos are an actual lifesaver! Absolutely perfect explanation and examples, keep up the fantastic work :)

[@AliKhan-zl2kk]

Sir your teaching in its way are SO unique. I understood every word and now starting to like physocs

[@menchTV]

Second semester of uni and already passed Mechanics 1,and just I understood moments from your video!

[@andreaunger145]

This is a great video, and very practical. Thank you for the resource!

[@simranprashar8416]

you actually make the stuff easy to understand. thank you.

[@mahnoorirfan8890]

I saw a few videos before this but they weren’t as helpful as this one.Thank you so very much!!

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I have a physics test coming up next week and this video is saving my life!!!!!!!! THUMBS UP FOR ALL YOUR PHYSICS VIDEO!!!

[@mattenmedia]

Awesome video. Really helped clarify for me. You have a great teaching ability, very clean and easy to understand. I was hoping that you would give an example of the 'toppling' style question. Any chance you could do this in another video, or send me a photo of a page of working of how to do them? Thanks

[@Stefmovie]

Keep up with the great vids! It helps a lot cause I have a test next Monday!!!

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What did you get? Got mine this Monday!

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Gilbert Virgo how did the test go

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I really appreciate his efforts for helping students

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This helped immensely, thank you so much!

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Concisely explained and clearly demonstrated, thank you so much.

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Thanks this helped me study for my physics test liked and subscribed :)

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Anyone doing physics for A level this man is teaching me better than my physics teacher

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my G helping me out with content i didnt even know i needed to know 😂

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Thank you so much, Science Shorts! You have really helped me through my entire sixthform education! Im about to go for the exam, thank you again! I must have watched this video 100 times in the past year haha!

[@ScienceShorts]

+Mustard Good luck! :)

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What grade did you get?

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What grade did you get??

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what grade did you get?

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What grade did you get

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You are a blessing from the heavens.

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Helped so much with understanding moments🙏🙏

[@JihadAlAnsari]

This is awesome for my revision :) Thanks!

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superb explanation,you have tremendously helped me.

[@nibber7652]

When you use the trig to calculate the upwards force, are you calculating the Nm?

[@2000mipo]

Thank you for content!!!!! It was so helpful, please do cover more topics. Thank you :)

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absolute life saver

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thank you for existing

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Making my academic life easier lot of appreciation ❤

[@timothyaaron8603]

A weight on a teetertotter causes it to rotate around the pivot like hands on a clock. seconds minutes "moments" - moments of inertia! thanks, I always wondered why they called it that.

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Thank you for this.

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can u plz come to my school and teach us physics your literally an amazing teacher!!!!!!!!!!!!

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Hi, I find your videos really helpful! Thank you so much for posting such helpful videos, I'm actually watching them in preparation for a test! :)

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For those studying A level Physics, are you using John Bird's electrical and mechenical text books? If so, are they that helpful in terms of aiming for top grades?

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eugenechelseafc89 try books by I.E.Irodov

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I use Hodder, CGP, edexcel revision guide and Edexcel student book.

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hey man im just winging it youknow

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Brilliant explanation sir 💛👍🔥 ...

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Thank you man.

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thank you for this!!!

[@Jxmesr10]

Fantastic video, really useful

[@vitag5712]

delightful

[@marcoponts8942]

At 12:47 tou choose a specific pivot while in the previous example you said we could choose the pivot point where ever we want. But, apparently, that's nit the case. Could you elaborate on that?

[@lordfarquaad9887]

delightful, thanks

[@nickp3385]

by any chance are you going to do more A-level videos because i find them quite useful

[@ayaan9646]

For angled moments when do we use sin and when do we use cos

[@famesheetbw3732]

Well done😊

[@MJ-hq1ie]

Still very confused, but that’s not your fault, it’s a good video, I’m just a little bit thick

[@beingprospera584]

No, you're not MJ. Which part confuses you?

[@ella-bk8cs]

lmao same

[@hasanmohamed4213]

@@beingprospera584 why does he do t2 X 2m and not t2 X 1m as is it not meant to be from the axis

[@beingprospera584]

@@hasanmohamed4213 that’s because he made point T1 the pivot and the total distance from T2 to T1(which happens to be the length of the beam) is 2m. If the centre of the beam was the pivot, then the distance for T2 will be 1m.

[@uchihaaliyah883]

Same I’m very confused at forces and angles

[@ruvcrafthajjali5277]

thanks man

[@kirstyborg8765]

Given to calculate the reaction between for ex a ladder and a rough wall, where do you make the reaction point to?? Thankyou

[@ScienceShorts]

Take moments about the bottom of the ladder. The centre of mass pulls, say, anticlockwise, but the reaction force from the wall pushes clockwise. The distances are going to be along the ground to the centre of mass's line of action, and vertical height the top of the ladder is above the bottom.

[@SabrinaXe]

Do you have Cambridge igcse questions regarding moments? Complicated crane problems

[@reverie9657]

8:36 is it possible to hold everything on the stick without any string attached to the stick?

[@phumudzomamatsiari787]

perfect...thanks a lot

[@krish-ut9de]

Thank you sir.

[@nomiee2004]

hi can you please make a video on kinematics and dt vt graphs etc. btw LOVE your videos such dense and full of actual syllabus content.

[@jenniferlopes6808]

Where can I get some good moment questions to practice from ?

[@mayixb]

Can anyone help me? I don't understand why with the questions where the flowers are hanging from the wall, he draws the red perpendicular line to the line of action. I understand that is is the force exerted on the wall by the rod but I don't understand why?

[@wheeler6768]

Could you ignore the perpendicular rule if you use components?

[@Adnovac]

The fact that we did 2 months of work on this and I get it in under 15 minutes here. My teachers are really lacking

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Sir can you please do videos on the new specification

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good video but invest in a ruler

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Can't afford one.

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@@ScienceShorts What's the price of a ruler in UK? Let me see if I can donate you some for buying one

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haha hunter bailey you just made an idiot of yourself coz science shorts guy is a genius

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@@mynahification you don't understand jokes do you

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Not necessary

[@aafroditii]

For the forces at angles section, I’m a bit confused on the line of action bit. I normally would resolve the tension, to find its vertical component, times that by the length, and then equal it to the clockwise moment. That would result in Tsinθ not Tcosθ though.

[@josh-kd4gb]

same with me lol

[@aafroditii]

@@josh-kd4gbthe reason why it’s Tcosθ is because he’s moving “through” the angle. Look at his resolving vectors video, it helped me a lot. Plus, if you do plenty of mechanics questions, you will get used to it! Took me ages to get it right lol

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so interesting!!

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thank u so so muchhh

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Legit video

[@12stembcastromarklexterdc.49]

is the weight of the plank in the force at an angle not counted?

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THANK U :)

[@jesse2436]

Delightful

[@justkillmechannel1656]

Thanks for teach me.

[@sachi6199]

quick question: why did you multiply T2 by 2?

[@kennethfontanillas5762]

Did not get it 5:50 How does the T2 x 2 put in the right side of the equal sign can someone explain to me the formula or FBD formula of this??? thank you!!!

[@merry2882]

Based on: sum of clockwise moments= sum of anticlockwise moments The moments going clockwise are the light and the weight of the beam, while the anticlockwise moment is only T2 so T2 x 2 goes on the right side of the equation

[@joshvir262]

Been watching these videos for past 2 days Exam is tomorrow I’m kinda sick of ur voice even tho it is quite amazing thanks for the videos!

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Empire joshvir262 edexcel? Me too. Good luck brother

[@rushvi1611]

i'm a bit confused at 10:42 u say the equation is TcosO x L/2 = W1L but isnt for the string, shouldn't the length be perpendicular to the line of action, so the length of the red line you drew not the half of L? ( O = theta) please answer if possible :)

[@Milosaur15]

TcosO is the vertical component of T, hence the length perpendicular from the pivot to TcosO is L/2 and not the red line

[@aurnaurrrcleaur]

@@Milosaur15 yh ok but then what was the purpose of the red line? Like how is it related to L/2?

[@Milosaur15]

@@aurnaurrrcleaur The red line was just to show the perpendicular distance from T to the pivot. However, it is difficult to find the length of the red line, so you resolve it to TcosO and use the perpendicular distance L/2 from TcosO to the pivot.

[@ahmedsarker3555]

5:07 how is the 200n and 80n going clockwise, shouldnt it be the other way round

[@ibrahimabdullah1012]

Don't give this man a medal Because he will probably throw it at a wall to find the momentum

[@ScienceShorts]

Nah, I'd flog it.

[@botran6934]

one question, should we count gravitational force as one of the forces that cause moment?

[@noctix7506]

You are actually counting the gravitational force in the downward force (weight) as gravity would act upon mass thus it would create a downward force pulling the mass down. So actually when we take weight in to account, we automatically know that gravitational force is present

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A-level paper 1 in 5 hours, good luck everyone :)

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It will work for generations 😂😂

[@fergusneave4630]

In the roundabout section of this video, If F1 and F2 have the same magnitude, are they a couple? Because if the roundabout is thought about like a clock, F1 could be considered (about) 7:30 and I would have thought that the opposite force to make a couple would have been (about) 1:30.

[@ScienceShorts]

Great question - the answer is no, as there would be a resultant force - couples must consist of forces that add up to zero i.e. no acceleration.

[@prabinshrestha5379]

nice sir

[@ahmadhaidar3070]

First, thank you a lot. I would like to know why the weight of the rod isn't considered in the flower basket example?

[@ScienceShorts]

Sometimes it is, sometimes it isn't - depends what the question says.

[@ahmadhaidar3070]

@@ScienceShorts Oh okay. Thanks bro.

[@hugostiglitz9149]

this is so usefull.

[@Jazthetryhard]

Thank you Thank you Thank you .......

[@josh-kd4gb]

At 10:30 I don't understand why the vertical component is Tcos0. Every time I have tried to work it out using triangles I seem to end up with a different answer. Could anyone help, would be much appreciated! :)

[@x4ol]

Well, in this scenario, tension is acting up, but at an angle. We cant just use "T" if it is at an angle. The tension T has a vertical component and a horizontal component. Think of it like two forces, one is acting horizontally and one is acting vertically, but they have different magnitudes. The resultant force of these 2 forces is T. So using trig (SohCahToa) we can find the magnitude of the V component. We want the component of T acting up from that point on the beam (or whatever it is), so we draw a line (light dotted line so it's less confusing) going up from that point. That makes an angle (theta) between T and the like (the vertical component of T). Using SohCahToa, T is the hypotenuse (h), and the side of the triangle we want is adjacent (a) to the angle, therefore to get this vertical component, we multiply T by cos(angle). Angle is always in degrees in mechanics. Useful tip is if you also need the other (here, the horizontal) component for something else, it will always be the other trig function (in this case, to get the H component, we ×T by sin(angle)). It is rare that we have to use tan. Even if the option to use tan was there, I would still use either cos or sin (meaning I would have to use a different angle).

[@x4ol]

I looked at your other comment. the other guy who said they would end up with Tsin(theta) is right, but the angle would be different. They are drawing a line downwards from the top of the line T, rather than what was done in the video, a line upwards from the bottom of T. The reason why it's sin and not cos is because Tcos(theta) = Tsin(90-theta). So using sin, drawing a line down from the top of the line T, we would get a new angle of 90 - theta. Do some past paper questions from 2017-2019 and check your workings. Or, try easier questions from your textbook so you can understand it a bit better before going to the big complicated questions.

[@itz_harman6106]

LIFESAVERRRRRRRR

[@pac-dx2rk]

Can you do more videos coz your videos are very helpful

[@saanvyik]

ik this is an old video but how can the following question be answered by the centre of gravity "a tight rope Walker walks with a pole in his hand. Explain.

[@whatdadogdoin7531]

How do I know which is clockwise moment and which is anticlockwise moment?

[@valarmorghulis209]

Saumadip Das look at the clock

[@valarmorghulis209]

Look at the clock ⏰

[@KingofHades208]

9:32 Wait so is the moment for the top part of the system equal to T multiply the length of the red line with the 90 degree angle that is perpendicular to the forces line of action? Or is it still Tcos theta?

[@ookiya235]

atu bro bnu atu pendingi, god bless.

[@braixendon5496]

5:47 Im not sure where he got the x2 from, could someone explain?

[@coldcactus23_3]

It’s the distance from pivot

[@MrBrandonHDGamer]

The rod, or beam or whatever the object is. Its weight acts in the centre, assuming it is uniform, hence the distance from one side to the middle is 1m, that means the middle to the other side is also 1m. 1+1=2, hence 2m distance when taking pivot at T1

[@mathiedits534]

could,not understand

[@urano4810]

@@mathiedits534 moment = force × distance. T1 is 0 because the distance is 0 since we are taking the moment about T1. T2 is 2 meters away from where we are taking the moment (T1) So it is the force of T2 × distance = T2 × 2 meters