Rotation and Torque - Physics 101 / AP Physics 1 Review with Dianna Cowern
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- čas přidán 18. 12. 2020
- Lesson 14 (Rotation and Torque) of Dianna's Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!
Exercises in this video:
1. If you are standing on Earth’s equator (radius about 6380km), how fast are you going? What is your rotational velocity? What is your angular velocity?
2. A tiny cat, mass 0.50kg is clinging to the edge of a record spinning at 45rpm. If the radius of the record is 0.10m, what is the frictional force keeping that cat moving in a circle?
3. If Dianna, mass 60 kg, is standing on a scale on the equator, what does the scale actually read?
4. Dianna and Marie want to balance on a seesaw. But Marie has 3 times Dianna’s mass. How far away from Dianna should they move the fulcrum in order to balance the seesaw?
Special thanks to propulsion engineer Diana Alsindy for her awesome shoutout at the end of the video! You can follow her on Twitter @DianaAlsindy
Credits:
Dianna Cowern - Executive Producer/Host/Writer
Jeff Brock - Lead Writer/Course Designer
Laura Chernikoff - Producer
Rachel Watson - Video Editor
Sophia Chen - Researcher/Writer
Erika K. Carlson - Researcher/Writer
Hope Butner - Production Assistant
Levi Butner - Videographer
Lauren Ivy - Set Design
Vanessa Hill - Consulting Producer
Aleeza McCant - Illustrator
Rachel Allen - Illustrator
Consultant - Kyle Kitzmiller
Lucy Brock, Samantha Ward - Curriculum Consultants
Cathy Cowern - Transcription - Věda a technologie
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!
Best of luck in achieving your dreams! God bless you!
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
@PLANT POWERED PUNK Ya okay mate?
@@abhilashasharmasuman6800 thanks 😊
Math problem
Best Integral problem
czcams.com/video/ut1m1fnY1LY/video.html
Watch for fun
"Spin isn't a very physicsy word." Particle physicist: "Hold my boson."
commenting because your comment doesn't have a comment yet and it deserves more comments.
13:47
If your not spinning
Your dead.
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.
16:52: "Another great way to get a handle on how torque works..." I see what you did there!
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❤
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.
I was yelling Centre of Mass when she tossed the letters in the beginning 😁
You put a lot into this Professor, I will have to watch it a couple more times to soak it all in. Great Job!!!!
This is something that I wanted to understand for a looonnnnggggg time.,... thank you soooo much Dianna
Really grateful that Diana's CZcams video always gives me beliefs while I face hard times in my Physics Modern Optics course.
Thank you, Dianna! I've learned a lot from your videos! Kisses and hugs from Romania! I wish you a Merry Christmas!
This is excellent Dianna. I am very much proud of you! Keep Up the Good Work.
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💕💕
Great video Diana. You elucidate difficult ideas very well. You’re the best!
This will definitely help for my term exam tomorrow... Thanks Dianna !!🤓
Love your Videos! 💕
I'm taking an 11th grade Physics course, and this is really an amazing supplement to my studies : )
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I love you!!! I can't not stop watching your shows non stop.
Every time I watch a video from Physics Girl, the excitement and enthusiasm for physics from her puts a smile on my face!
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!
Thanks. All teachers can be heroes, whether they wear capes or not.
I am an Aerospace Engineer at UB and I still watch your videos... they are amazing how you explain everything
Such a wonderful enthusiasm you have for physics! Thank you very much!
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
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!
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🇮🇳🇮🇳🇮🇳🇮🇳❤️❤️
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Math-aficionados: Yeah that makes sense.
Everyone else: **confused math noises**
That looks like a 33 1/3 RPM record to me. At 45 RPM you get chipmunks singing.
It could be a 12" single?
They had those when I was young, in the previous century.
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.
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.
Thank you Miss Diana !!! U make a lot things understand much clearly than a lot others
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.
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
the basics of leverage..
I wish you and your a happy New year and look forward to many more enjoyable videos.
Haven't watched yet , but something have wanted to learn for Soo long
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!
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.
Thanks for putting efforts in making these videos
Really enjoyable.
All mother of pure and good
I have exam on this tomorrow
And u are here to help me
Changed my thought of rotation concepts good job Diana Ma'am
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.
This is so fun to watch!
Thanks for all your videos
I searched for rotational kinetic energy and Your video helped me very much 👏Thank you🤝
Great video. Thank you. I would love to hear more about angular acceleration.
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.
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.
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.
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.
thank you, Diana. I really needed help with torque
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. 🤯
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 😊
czcams.com/video/OHqeHpguVHo/video.html
Door knobs on the show "Family Affair" were also in the center of the door.
They were also in the middle of doors in my uncle's house when i was young. 30yrs ago approx.
Wishing our dear Physics Girl and to all of us physics lovers a very merry Christmas 🎄
Loving these 101 sessions... keep it coming
czcams.com/video/OHqeHpguVHo/video.html
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.,
Enjoyed your video presentation. What if you use a Right Angle (90 degree) screwdriver to increase the radius, thereby increasing the torque (since according to your formula both the force and the radius are directly proportional to torque).
_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_
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
@@BuffaloEdward Pray tell, why are Physics Girl's comments sections so damn weird? I just want to see people discussing the video...
@@sasdagreat8052 because they are quoting others who have entertained whilst educating.
@@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.
Thanks for another video for learning physics :)
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.
When this series ends are you going to start filming a more advanced course?
Hey , Dianna at 3:21 , Isn't our earth in Spherical Shape , So The Distance is its Total Surface Area , Right ?
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 ?
Diana one question for you...why torque is always perpendicular to the direction of motion? And how direction of motion is related to direction of torque?
amazing video !!!!
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Hey Diana. Shouldn't the torque of the screwdriver be your answer times four, since you were using a phillips screwdriver?
Hi Dianna! Your videos have inspired me and I want to now major and study physics and want to become a physicist soon. Do you have any tips for people who want to study physics?
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.
This speaks to me on so many levels , not least VINYL!
So when you work on an engine and add what my Dad called a breaker bar (a pipe slid over the end of the wrench to lengthen it.) You a adding a torque multiplier?
This is your good turn for the day Diana ;-)
Class 11th, needed this!
Crazy ! I'm subscribed to you but I never ever ever get a notification for your videos..?
Have you clicked on the bell?
Maybe your notifications are off
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.
Dear Dianna, I have some magnetodynamics stuff where torque, harmonics motion, levitation take place.
Is torque the same a moment in the US? I always learned that the difference between torque and moment is that Torque is balanced. Like if you apply torque, you would apple a force from both sides of the rotational center with a opposite factor, resulting in the sum of Fx and Fy being zero. Or is a moment just te same as torque?
Thanks a lot
I have thought of it what I was in my teens, I fell in love with physics and science then!!
I am waiting for your next lesson for about two weeks. Can you please upload soon?
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!
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
Thanx mam bcoz of you my concept are becoming very very strong.
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D. is there any way you can start again at the 4th grade education on your CZcams, cause I having problems of you educating me. :)
Hobbit hole doors would have the door knob on the side if the author was J.R.R. Torquien.
Math problem
Best Integral problem
czcams.com/video/ut1m1fnY1LY/video.html
Watch for fun
You win the comments section!
If there is a free body floating in space and a force is applied to it some non-zero distance along an axis away from the center of mass, how do we solve how much of the resulting acceleration of the object will be rotational versus translational?
If a wheel one foot in circumference is rolling down a road, and there is a bug an inch from the center of the wheel, after the wheel is one foot farther down the road, the bug is also one foot farther down the road. But that spot on the wheel didn't revolve a whole foot. What pattern of movement did it take? An ellipse?
You're a life saver btw
what is the background music at the beginning of the video?
Could you call the inward frictional force - cenfrictional force?
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.
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.
😅
Actually in Greek the Letter T is not pronounced Tau but Taf.
I really don't know how Tau became a thing
The EM drive can't give thrust but can it ad torque
Love it
❤️❤️
I love you. You are making my life so easy🙂
Surely the distance contraction of a fast-moving object depends on the frame of reference, doesn't it?
IIUC, a distant observer would see a fast-moving object contract, while a second observer moving rapidly (relative to the first observer) would not see themselves contract; they'd see space contract in their direction of travel. So, therefore, the solidity or rigidity of any object depends wholly on the frame of reference used. Is it, or not really?
You go slightly more than one rotation a day to make up for the orbit around the sun, right?
lovely diaana
love your classes
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"
Ah yes, another English lesson with Diana. Really like them.
Thank you & love you manner of teaching but the symbol is not Omega (not sure which Greek letter it is maybe Rho?)
From exploration to teaching👍👍👍
☺😊😀😁😂5 Smile's Did you work out the handle on the international space station spins one way like 4 times then one the other way once???? Triped stuff in '0' G. (Merry Christmas and happy new year)
I am at the yeah will take your word for it ! WAYYYYYY beyond me
Learning is awesome.
You are the best⚡️
mark me present.
Love the series and videos.