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

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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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Perfectly balanced, as all things should be

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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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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]

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

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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

[@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.

[@beastfrombradford6685]

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

[@simranprashar8416]

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

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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!

[@Hot-IceAvocet]

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

[@menchTV]

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

[@andresky1715]

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

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

[@andreaunger145]

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

[@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

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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!!!

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I really appreciate his efforts for helping students

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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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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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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

[@dansee123]

absolute life saver

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Helped so much with understanding moments🙏🙏

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

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Thanks a lot! Plz keep it up. You are helping so many!

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Making my academic life easier lot of appreciation ❤

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superb explanation,you have tremendously helped me.

[@2000mipo]

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

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Thank you for this.

[@lakshyaagrawal8790]

very helpful for my as levels thank you 'science shorts'

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Thank you man.

[@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.

[@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

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thank you for this!!!

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delightful

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delightful, thanks

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

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thanks man

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Brilliant explanation sir 💛👍🔥 ...

[@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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perfect...thanks a lot

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Can't afford one.

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Not necessary

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Well done😊

[@eugenechelseafc89]

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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Thank you sir.

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

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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! :)

[@Jxmesr10]

Fantastic video, really useful

[@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.

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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.

[@haneenhammad8562]

thank u so so muchhh

[@justkillmechannel1656]

Thanks for teach me.

[@ayaan9646]

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

[@jenniferlopes6808]

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

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so interesting!!

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THANK U :)

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Sir can you please do videos on the new specification

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Legit video

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Delightful

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

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

[@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?

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

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

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It will work for generations 😂😂

[@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?

[@12stembcastromarklexterdc.49]

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

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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.

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nice sir

[@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

[@wheeler6768]

Could you ignore the perpendicular rule if you use components?

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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

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Can you do more videos coz your videos are very helpful

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this is so usefull.

[@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

[@sachi6199]

quick question: why did you multiply T2 by 2?

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LIFESAVERRRRRRRR

[@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.

[@ahmedsarker3555]

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

[@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.

[@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.

[@tumelothobileng6302]

Im very helpful

[@alanabeaumont2650]

It's very nice, but I came here to find the elusive 'vectors trick' video. Can someone link? (It seems to not exist)

[@ScienceShorts]

Now back up. Will be replaced in a few days.

[@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 ⏰

[@johnbiddleston8987]

still watching years later...

[@raphaellafleur1146]

helpful