Rotation and Torque - Physics 101 / AP Physics 1 Review with Dianna Cowern

[@itsreeah2663]

Hello, if ur reading this, I just wanted to tell you something. It's unlikely you probably are, cos coment sections fill up so first and I am sorry if there are any typos. I am blind, and my ambission is to become a scientist, it's been that for as long as I can remember. I am so glad I found your channel, your vids inspire me so much!

[@abhilashasharmasuman6800]

Best of luck in achieving your dreams! God bless you!

[@J4-kjtdr8775]

I don't think she looks at her comments to often because there is a lot of people that leave inappropriate comments. Let me know what level you are on because I know very little also but I have had a lot of thought experiments in my life how about you maybe we can converse with each other I don't claim to be at physics girl level but I enjoy talking to people about the universe and there point of view on it

[@sasdagreat8052]

@PLANT POWERED PUNK Ya okay mate?

[@itsreeah2663]

@@abhilashasharmasuman6800 thanks 😊

[@mr.knight8967]

Math problem Best Integral problem kzbin.info/www/bejne/q6WUnmSco75kgrs Watch for fun

[@Rubrickety]

"Spin isn't a very physicsy word." Particle physicist: "Hold my boson."

[@TangoIndiaMike144]

commenting because your comment doesn't have a comment yet and it deserves more comments.

[@mol-lyn]

13:47

[@heaven4247]

If your not spinning Your dead.

[@Mohammad_1Lotfi]

Love these series. They helped me grasp even more from my physics class and be able to have a better approach to solve problems. Thanks.

[@halepauhana153]

16:52: "Another great way to get a handle on how torque works..." I see what you did there!

[@kristinaivanovic1499]

I'm actually still in middle school,and my dream is to become an astronomer,thank you for making physics not look so intimidating. Love from Montenegro❤

[@mako9673]

Love how passionate Dianna is on science. I love science, but don't often see others have such a joy and enthusiasm for it like Diana does! Keep it up.

[@x3non57]

Math-aficionados: Yeah that makes sense. Everyone else: **confused math noises**

[@maumau9466]

I was yelling Centre of Mass when she tossed the letters in the beginning 😁

[@ayushkr.3944]

Thank you Dianna for all your physics videos they help us to understand how much physics is important to us even in our daily life. Lots of Love from India🇮🇳🇮🇳🇮🇳🇮🇳❤️❤️

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@Valdagast]

_Just remember that you're standing on a planet that's evolving_ _And revolving at nine hundred miles an hour_ _That's orbiting at nineteen miles a second, so it's reckoned_ _A sun that is the source of all our power_

[@BuffaloEdward]

The universe itself keeps on expanding and expanding in all of the directions it can whiz As fast as it can go, at the speed of light you know, 12 million miles a minute and that’s the fastest speed there is So remember when you’re feeling very small an insecure how amazingly unlikely is your birth And pray that there’s intelligent life somewhere out in space ‘cause there’s bugger all down here on earth

[@sasdagreat8052]

@@BuffaloEdward Pray tell, why are Physics Girl's comments sections so damn weird? I just want to see people discussing the video...

[@ouzoloves]

@@sasdagreat8052 because they are quoting others who have entertained whilst educating.

[@sasdagreat8052]

@@ouzoloves Huh, those are quotes? Didn't recognise them, sorry. There's other weirder comments that definitely aren't quotes, though: they seem more like bots trying to spread random messages.

[@VitaminGK]

Another simple way to explain torque in basic terms. Door handles are placed towards the ends of doors (away from the hinges). The reason is because Torque increases with increasing distance from the centre. And hence doors are easier to open when the handles are placed towards the edges and not near the hinges

[@amojak]

the basics of leverage..

[@mentatphilosopher]

That looks like a 33 1/3 RPM record to me. At 45 RPM you get chipmunks singing.

[@jeroenrl1438]

It could be a 12" single? They had those when I was young, in the previous century.

[@BLynn]

I thought the same. If it is an LP it will be played at 33-1/3, even the single large discs I am fairly certain were played at 33-1/3 but it would depend on what the record was marked with.

[@pipertripp]

we're old, mate. I saw that record and immediately thought the same thing. And I remember playing LPs at 45 rpm on my parents' turntable and giggling at the chipmunks.

[@sumans7620]

Love your Videos! 💕 I'm taking an 11th grade Physics course, and this is really an amazing supplement to my studies : )

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@RobertSmith-pw9io]

You put a lot into this Professor, I will have to watch it a couple more times to soak it all in. Great Job!!!!

[@denizdurmus1120]

Great video! I’ll have my students watch it. Never thought about the rotation of the earth reducing our weight... and will definitely use it as an activity. Thanks!

[@criticalthought7527]

Thanks. All teachers can be heroes, whether they wear capes or not.

[@gab.lab.martins]

Honestly, I don’t need to (re-)learn any of this, I’m very past high school, and I actually remember most of the theory (even if the formulæ escapes me). But I love listening to Dianna, she could narrate a river flow for 5 hours straight and I’d be there with my eyes closed. One of the sweetest people on this platform.

[@chengyoujiang6076]

Really grateful that Diana's KZbin video always gives me beliefs while I face hard times in my Physics Modern Optics course.

[@sooryasijin3343]

This is something that I wanted to understand for a looonnnnggggg time.,... thank you soooo much Dianna

[@absoluteasinine]

This will definitely help for my term exam tomorrow... Thanks Dianna !!🤓

[@EnsoTB]

I got genuinely excited at the screwdriver revelation when you compared the radii of the handle and the screw... This is why there is beauty in everything, you just have to look for it!

[@harrisonturner1401]

Haven't watched yet , but something have wanted to learn for Soo long

[@mohemmedilham3854]

Eventhough I already understood this lesson in my classes I keep watching for you physics girly. And it worths a lot and gives me very different perspective. I am so proud to be your student💕💕

[@andrew50165]

I am an Aerospace Engineer at UB and I still watch your videos... they are amazing how you explain everything

[@olddadoutdoors]

Every time I watch a video from Physics Girl, the excitement and enthusiasm for physics from her puts a smile on my face!

[@FlyingSavannahs]

Hobbit hole doors would have the door knob on the side if the author was J.R.R. Torquien.

[@mr.knight8967]

Math problem Best Integral problem kzbin.info/www/bejne/q6WUnmSco75kgrs Watch for fun

[@willmendoza8498]

You win the comments section!

[@adituta8660]

Thank you, Dianna! I've learned a lot from your videos! Kisses and hugs from Romania! I wish you a Merry Christmas!

[@1d1hamby]

Door knobs on the show "Family Affair" were also in the center of the door.

[@martf4701]

They were also in the middle of doors in my uncle's house when i was young. 30yrs ago approx.

[@samedwards6683]

Thank you so much for creating and sharing this educational and entertaining video. Great Job. Hope that each day you are feeling better than the day before

[@guruprasath8408]

All mother of pure and good I have exam on this tomorrow And u are here to help me

[@josephputnam2964]

Humor is how I remember things. Torque is represented by the symbol Tau, therefore I remember they are related from the word Twerk. Every time I think of this I laugh to myself.

[@ritzzzblitzz6833]

😅

[@brokolosbinala2970]

Actually in Greek the Letter T is not pronounced Tau but Taf. I really don't know how Tau became a thing

[@davidhhaindongo9405]

This is excellent Dianna. I am very much proud of you! Keep Up the Good Work.

[@localtitans4166]

Thank you Miss Diana !!! U make a lot things understand much clearly than a lot others

[@ViiKing_]

I'm in university right now and I've already done these parts of physics ages ago but it's still great refreshment and wonderful entertainment.

[@sitarnut]

I don't know any advanced math, but do know from riding my 650 Triumph Tiger motorcycle, that engine torque is what powers me up a steep hill....or, around another rider in a curve.The Triumph has tons of torque. Centripetal mass in a running motorcycle engine is also very complicated to my brain. Love all your posts Dianna. You're the "living end" as we Beatniks used to say of something that was way neat and superior.

[@potawatomi100]

Great video Diana. You elucidate difficult ideas very well. You’re the best!

[@EnriquePerez-up1ev]

I love you!!! I can't not stop watching your shows non stop.

[@WilliamsSkilliams]

I just finished physics and am only just now getting recommended these..... I really could have used these 4months ago lol damn it! Great videos they are really clear and fun to watch!

[@johnnicholson8811]

@Physics Girl You are using 86400s as one turn of the Earth, but it is not that. Keep in mind that the Earth goes around the sun and so a turn with respect with the sun is different than with respect distant stars and galaxies. Effectively, the Earth turns one extra turn per year in about a year (and about 20 minutes extra in that year). In other words, a sidereal day is about 23Hours 56 minutes or about 1 degree per day less. This may seem small, but it does add up over a year to the point that an extra sidereal day pass per year. Try 86164 s.

[@BMR86]

19:54 who else thought she was gonna fling that hammer in the air? haha

[@daveturnbull7221]

Yup 😉

[@maumau9466]

Yeah... I thought she will put a fluorescent sticker on the center of Mass that she found out by balancing it and then toss it

[@2azy_creative]

I love you Dianna ❤️ you are the best educator ever!!!! I didn't expect that there could be so much physics hidden in a screwdriver. 🤯

[@daveturnbull7221]

I'm waiting on the videos explaining how chisels and saws work - perhaps then I'll be able to make a stool to sit on and contemplate the universe 😊

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@wyldride]

Torque, it's handy to note, is the detailed explanation of the mechanical advantage of a lever, which is why it amplifies the effect of the force by applying it through a longer distance.

[@pierreabbat6157]

To be precise, you should use the sidereal day (86164 s) when calculating the earth's rotation. The contraction along the circle of rotation is significant in a neutron star. I have a hard time picturing the geometry of a neutron star.

[@WarpedYT]

Crazy ! I'm subscribed to you but I never ever ever get a notification for your videos..?

[@Merlin3189]

Have you clicked on the bell?

[@sarahkhan4154]

Maybe your notifications are off

[@TryAdaptLearn]

Warped Perception I agree with the replies about the bell. For example, when subscribed to your channel I notice without the bell, I only get your videos of inside engines and tires recommended to me.

[@cagataycakirtas8064]

When this series ends are you going to start filming a more advanced course?

[@TryAdaptLearn]

This is a great video. Just like records, we can adapt the lesson to vehicles and machinery. For example, the use of torque as a standard unit of measurement to help communicate the performance of diesel/gasoline engines and electric motors. Then later how they transmit the rotational torque to the tire then use it with friction to transfer to linear motion of the vehicle.

[@aveekdas4948]

Wishing our dear Physics Girl and to all of us physics lovers a very merry Christmas 🎄

[@nathanielnatejacobs4619]

Hey , Dianna at 3:21 , Isn't our earth in Spherical Shape , So The Distance is its Total Surface Area , Right ?

[@sabarishssibi3382]

I searched for rotational kinetic energy and Your video helped me very much 👏Thank you🤝

[@AhmetMurati]

As I was studying Computer science we had a subject Physics our lecturer asked a question "Imagine we have a disk that is spinning, in a random moment a chunk of this disk is detached. What happens to the to disk?" Nobody else knew the answer. So, I raised my hand to talk. "Due to the fact that the mass of the disk initially is universally distributed across its body. When a chunk of disk is detached then the mass is not any longer equally distributed so the dusk has a new center of gravity and it changes how it is being rotated." All other students were amazed by this answer.

[@MrNess2911]

Such a wonderful enthusiasm you have for physics! Thank you very much!

[@jerrybyers2172]

Thank you, Lovely Lady! That lecture brings concepts to mind that under normal circumstances never get noticed! The balance between the rotational velocity and gravity keeps us from flying off into space, but doesn't crush us. Likewise on the moon, although we can jump much higher, So if we find a planet the same size and mass as the Earth, but it spins 20 times as fast, it may not support life as it is on Earth.,

[@k001daddy]

Should have used that clip from Apollo 11 where Buzz spun a can of ham spread and applied torque to demonstrate gyroscope motion.

[@k001daddy]

kzbin.info/www/bejne/rX28Yoqne7Rlqpo

[@rickharriss]

I wish you and your a happy New year and look forward to many more enjoyable videos.

[@paschoal1394]

12:50 the square on omega

[@AthAthanasius]

Yup, Dianna forgot to write the supercript '2' on the numerical value for this instance (and it didn't get edited in later), but ~2N is correct if you use the correct number there.

[@hugohernandezfalcon155]

Who would love to see an electromagnetism course,? I say because of the formula she has in the back hanged, it would be so cool to see her teach such an amazing topic!

[@2azy_creative]

Thank you Dianna 😀 Becuz yesterday in my test they asked what is the angular velocity of earth 🌎 And I saw the video the day before so it helped me a lot.

[@rmsgrey]

There's another significant reason why door-handles are on the edge rather than in the middle - because that's where the door latch is - a door handle in the middle of a door that's a meter wide would need half a meter of mechanism to connect it to the latch; one on the edge needs maybe a centimeter. The stereotypical bank vault door engages with the frame all around, rather than just on the edge away from the hinges, so the handle there is centered (though there may also be a hand-hold at the edge for better torque). I'd also like to share a life hack for screwdrivers - if youre faced with a particularly stubborn screw, you can use a pair of pliers (or a monkey wrench) to grip the screwdriver and provide a long lever arm to use to boost your torque. Use with caution though since a thoroughly stuck screw can require an amount of force very close to the amount required to break the screw-head.

[@mohdshoebimmm5494]

Changed my thought of rotation concepts good job Diana Ma'am

[@colingreysful]

This is your good turn for the day Diana ;-)

[@Bailey-zn2je]

You have a really nice writing style ..:)

[@TheLowstef]

At 12:56-ish there is a mistake in the write-out. The value for omega is not squared. The final calculation is with the correct squared value

[@bonchonjonjon]

Fact: To have an easier time taking out a tight screw, you want a screwdriver with a thicker handle, not a longer one.

[@rmsgrey]

Depends - a longer handle will give you more surface to grip - in an extreme example, being able to use both hands is going to do better than a 1% increase in thickness. But, yeah, all else being equal, a thicker screwdriver will help more than a longer one.

[@markbernier8434]

Grip and wrist strength too. If I can hold my wrist straight then the radius over which the torque is applied could be nearly a meter and perhaps 50kg applied tangentially. No wonder you can tear heads off screws.

[@anullhandle]

@@markbernier8434 yup. Or just use the hex on the end of the shaft lol. Looking at the handle diameter for torque is like assuming spherical cows ;)

[@TheHuesSciTech]

Tangentially (lol), I find the circumference of the earth easier to remember than the radius, because the meter was originally defined as one 10,000,000th of the distance from the equator to the North Pole (via Paris, maybe?). Anyway, that's travelling 90 degrees around the earth; a full revolution/circumference is therefore about 40,000 km.

[@Combat.Wombat.official]

3 points to note, 1: Diana is extremely excited that she managed to catch the pen, 60kg is a tiny human, and Diana says she is running out of room during the conversion of earths lineal velocity to rads yet the paper goes on for the rest of the video. Also from looking at the comment section, I don't think people understand the boring side of physics, being the very basic beginners to the yr11 students, you will be using this for your entire physics carrier, you don't get to move up, you just add more equations, but you will always be using the fundamental ones as well, for ever, none of them go away

[@michaelterrazas1325]

The length of the screwdriver has an effect also. It's easier to torque a screw with a longer screwdriver. The screwdriver can be at a small angle and you get a bit more torque.

[@skipd9164]

I remember getting into an argument with some classmates in high school. I was in the machine shop class where most kids were burnouts. They told me if you fall from a high place and are standing on something. Just as your about to hit the ground you jump and nothing happens. I told them to just keep smoking pot because there is no future in there life. Momentum

[@TSKseattle]

The main reason doorknobs are on the edge is the mechanism need to latch and open the door (and deadbolt). A knob in the middle would need a large drawbar out to the edge of the circumference and would get flimsy. The hobbit door can still be pushed at the edge, for instance right hand on the know, left hand pushing in.

[@Whitbypoppers]

Are you considering the difference between a solar day and a sidereal day? Because of its path around the sun, the earths turn more than one complete revolution in 24 hours (about 1/365.25 revolutions or slightly less than one degree).

[@SKARTHIKSELVAN]

Thanks for putting efforts in making these videos Really enjoyable.

[@jaysartori9032]

I have thought of it what I was in my teens, I fell in love with physics and science then!!

[@ligh7foo7]

I have finished an online science class, and now doing maths and realising my tool needs a lot more sharpening then I thought.

[@Villaboy78]

This speaks to me on so many levels , not least VINYL!

[@pierfrancescopeperoni]

Even without talking about length contraction, rigid objects cannot exist in relativity because impulses from the point of application of the force to the rest of the body cannot reach the speed of light, so if a rotating body has a tangential velocity close to speed of light, or if it is very long, then the impulse has not yet reached one part of the body that the point of application is already very far away, resulting in an evident distortion of the body for any type of material.

[@jlunde35]

Great video. Thank you. I would love to hear more about angular acceleration.

[@nishthasharma22]

thank you, Diana. I really needed help with torque

[@PranavShroti]

Loving these 101 sessions... keep it coming

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@anti-dope9608]

If an object is red then it absorbs all other wavelengths except red. Then what happens to absorbed energy. After absorption the object must emit the same energy after sometime right. So after sometime along with red all other wavelengths should also emit so every object should be white. Why this is not the case. Explain in terms of orbits of electrons around nucleus.

[@soumikdhole2523]

Torque concept is indeed much interesting than I thought.

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@stacyroe619]

Every fact in science must first undergo seven stages of evolution 1st is the idea 2nd is the concept 3rd is a cursory hypothesis AKA plausibility 4th is a working hypothesis 5th is a plausible theory 6th is a working theory 7th is accepted fact within the limitations of current math and science . Now I know your question what is a cursory hypothesis it is when your hypothesis is still too weak to test whether or not you can disprove it it is when your hypothesis is so new that you must first prove if it is even plausible if you can prove it plausible then it is elevated to trying to disprove it

[@empurress77]

Good video (as always) You're still missing that gyroscopes can be spun (while spinning) and create linear thrust. *I've done it. It works Think of a gyro in place of a propeller on a plane, and the plane is a ride on a merry go round. If the gyros are spinning very fast AND the merry go round is spinning very fast you would actually get the merry go round to fly up. (You would actually need a duplicate set up counterrotating just like a set of blades on a helicopter would) I call the effect "Positive gravity"

[@sakshammisra189]

From exploration to teaching👍👍👍

[@Szymmon614]

Ah yes, another English lesson with Diana. Really like them.

[@osmosisjones4912]

Their plenty of force's the counter gravity. Heat to same side charge. What is negative Mass. . And would the dark energy break a ship up scenes it breaks up mass then galaxies themselves should break apart

[@Nephelokokkygia1215]

8:31 A 12" LP like yours plays at 33 1/3 RPM. A 7" 45 plays at 45. :)

[@nikunjdeepupadhyay5058]

Thanx mam bcoz of you my concept are becoming very very strong.

[@grabstox4399]

kzbin.info/www/bejne/hXnUlnumnNqJftE

[@arunbhardwaj2744]

I am a high school student and I am very confused in thermodynamics, My confusion is that :In physics, when we study thermodynamics, we say that we cannot find the work done in irreversible processes because in such processes the different state variables of the gas are not defined. For example, the pressure in different regions of the system is different when a gas expands quickly. Yes, I also agree with that. We cannot directly find the work done in such a process, because we don't know what pressure of gas should we take, but I think, even if we cannot calculate this directly, we can calculate this indirectly like we do in chemistry. In chemistry for example, when we find the work done in irreversible compression, we can find how much work is done by the surroundings on the system because the pressure of the surroundings almost remains the same. Let's assume +W amount of work is done on the gas, so it means that it has increased the internal energy of the system by +W (assuming no heat is released), so it also means that surely the work done by the system on the surroundings will be −W; to absorb that much energy, it has to do −W amount of work on the surroundings, and there is no other thing from which energy can be exchanged. So, all I want to ask is: Why we don't do it like this in physics? What's wrong with it? Why do we say that we cannot calculate work done in irreversible processes like this? Please guide me towards the right path without using higher mathematics just explain it in brief, then it would be easier for me to understand.

[@jimmychin8313]

The door knob example might not be the best eg to use as both scenarios are still workable. I suggest that knobs closer to the side are possibly due to easier installation & less complicated latching mechanisms required ?

[@gowdsake7103]

I am at the yeah will take your word for it ! WAYYYYYY beyond me

[@zippythinginvention]

This brings up several things that are way beyond my mathematical knowledge... Let's think about unidirectional force. There are a few pretty compelling but weak examples. The simplest is to take a rotating disk and place another rotating disk near its perimeter. Pulses of torque can be applied to the outer frame by either mounting the second disk asymmetrically (traditional) or by applying torque through timed acceleration and deceleration of the inner frame. I've experimented with this and had some really counterintuitive results. It's hard to describe the setup... If you replace the mass of the inner frame with a gyroscope, it will very preferentially align itself with the rotating frame of reference its attached to. Specifically, if you spin up the gyros and then spin up the outer frame, the gyros are still locked to the outside frame of reference. But, when torque is applied from the rotating frame of reference, the gyro locks to that. I think that if this was properly examined, it could be like Star Trekian impulse drive. Strictly mechanical propulsion without propellant. //endcrazytalk

[@M1551NGN0]

I'm gonna rock JEE mains 2024 with these videos🔥

[@mitchellfolbe8729]

This was a tough lesson. Had to stop a few times and let it sink in. Would be great to have you do a torque lesson as it applies either to automobiles or even one to sports like swinging a golf club or throwing a ball.

[@slaeyvasramm2460]

If you were my physics teacher I would actually fell definitely a bit frictional attracted to you! Lol. Happy holidays and keep on this awesome videos! 👌💯

[@stanrock01]

This is so fun to watch!

[@Dhanush-zj7mf]

It's nice how you explain everything without using any cross products. But at 21:23 why is the same torque is at the bottom I think that the reason for this is that the bottom and top have same angular velocity and hence same torque. But I don't know if I am wrong if yes can anyone say me what is the real reason behind the torques at top and bottom being equal... TQ

[@vlp7]

Class 11th, needed this!

[@lucassimon4348]

Well that was fun!!!! Thanks lady your great to listen to while im working and sometimes very distracting lol.

[@lorenz6703]

You made a Mistake!!! You calculated with 24h -> one solar day -> but thats more than one full rotation One full rotation of the earth would be a Sidereal Day -> only 23h 56' could you crosscheck that? Thanks! really liked the video!

[@himanibhyan7569]

Thanks for all your videos

[@sudanamaru]

Dear Dianna, I have some magnetodynamics stuff where torque, harmonics motion, levitation take place.

[@AmnonSadeh]

Yes, X = ¾L (18:50) but you missed the opportunity to show that it means L-X is 3 times X. Which should feel intuitive because it's proportional to the weight ratio.