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- Опубликовано: 30 сен 2024
- 052 - Torque
In this video Paul Andersen begins by discriminating between translation and rotational motion. He then explains how a torque is the product of the lever arm and the force perpendicular. The lever arm must be perpendicular to the axis of rotation and the force must be perpendicular to the lever arm.
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All of the images are licensed under creative commons and public domain licensing:
“Balancing Act.” PhET. Accessed September 4, 2014. phet.colorado.e....
MidnightLightning. English: SVG Version of Adjustable Wrench.jpg, April 14, 2009. Own work. commons.wikimed....
Technik, RusCloud-SVG fileThe Lexikon der gesamten. English: SVG Variant of L-Door.png., September 14, 2010. Own work. commons.wikimed....
better than Khan Academy, without confusion, clear and complete explanation!
Dudes carried me through, AP bio, higher end college bio, chemistry, and now biomechanics. He truly does it all😂
Holy fuck this video is amazing. You are brilliant. I finally understand torque.
Don't use expletives
Very clear and helpful, thanks!
thank you so much, ill pass my final bc of you!
Great !!
what is lever arm
The distance from the axis of rotation, to the point of application of the force.
thank you for all you do Mr. Anderson, you help me all the time and you don't even know! Thank God for people who enjoy helping others like you!
once again, you're out there doing God's work
***** no he's teaching us poor students how to understand this stuff which is God's work
no, he's teaching evidence-based science, which is the opposite of a religion that invented god
Haha you're Funny , God Is Dead, but can live in you're heart wenn you're afraid of the world that can help you, carrefull of skyzophrenia XD (sorry my righting is not perfect).
guide me about resultant movement and movement of inertia
Thank you, sir.
You are ALWAYS helpful Bozeman Science !!! I`m a pre-med student, and I always find myself looking through your videos whenever I need to refresh my science knowledge. I love your videos!!
+sweetienena ME too! :)
Are you a doctor now 😍 im currently studying for the med entrance exam it is my dream to be a doctor
Thank you for a good explanation of how it works! I still don't know WHY it works and will continue to assume it's magic.
I mean you can try it yourself with a wrench trying to unloosening a bolt when you place your hand on the wrench closes to the bolt vs. when you have your hand further out... You can feel the significant difference in the amount of force that you have to apply...
***** I've opened a door before; I'm not doubting that torque exists. The question isn't "does this happen?," where the answer is obvious, but rather "why does it happen the way it does?" My answer to the latter question is in my next reply.
Aηακιη Μεmεωαlκεя You're just rephrasing the question and presenting it as an answer, though that's probably my fault for not specifying an actual question. My real question was intended to be "why does changing the lever arm change the amount of work done by the same force?" Your answer that a closer point to the pivot "has" to move less distance implies some law of nature that isn't covered in your explanation, nor in the video. A point closer to the pivot DOES move less distance than a point further away under the same force, but why? Someone may be tempted to jump in and tell me that I missed the point and that this law of nature I'm looking for is the equation: torque equals the product of the force and the radius, but that's only describing the observation, and now we're in a circle.
After thinking about it some more, I've decided on an answer that satisfies what I was personally curious about. As shown in the video, applying a force to the center of gravity/center of mass causes translational motion in an unfixed body. Applying the force off-center produces both translational and rotational movement. The part I was missing is that the work being put into linear motion doesn't change when the object is attached to an axis. Pushing a door at a point closer to its hinge puts more work into moving the hinge linearly, but the hinge resists this motion and the work is wasted. That's why it's more efficient to have a longer lever arm: not that there's more work being done, but there's a more advantageous ratio of rotational work over translational. If this is true, though, I don't think there's a lever big enough to move the world, as some have claimed.
Jamie Den Adel Maybe think about it this way... Lets say the door is perpendicular to you as it hangs on top of you, ik it's weird but hear me out... You're trying to do everything you can to bend the door from its hinges. Now you have 3 handles, pretty much one is the closes to the hinge, the other one is at the middle of the door, and the last one is the furthest away from the hinge. Which handle would you choose in order to try to bend the door? Idk hopefully that helps you out because the ends of the door is where you are most likely to bend the entire door if not knock it off of it's hinges...
I know exactly what you mean.
It is weird. Most people just memorize this lever effect. They don't think about the fundamentals..... They assume it is some kind of black magic. As if you would gain some energy like in a perpetuum mobile.
I don't want to confuse you, but it could have something to do with centripetal force. Centripetal force is the force that is responsible to keep an object on its circular motion. (look it up if you don't know what it is)
The closer a force is applied to an object the smaller the centripetal force gets. So the Torque also would get smaller.
After all centripetal force ( or torque) is caused by the inner molecular bindings of a material that holds the system together.
Like si vienes de parte de la de materiales👍
Pasame la respuesta qlo
Watched one of your AP Bio reviews before my exam and got a 4 or 5. Can't remember. Now I'm at Purdue, watching this before my Physics exam. Hopefully similar results. Thank you!
nice lie
Aziz Kash its a lie cause he’s doing better than you?
@@rijulranjan8514 😂😂
Great explanation
At 3:04 I thought that the door was going to hit his head
Lol
a really helpful, brief yet short, understandable explanation. Thank u!!
You are the best Mr Anderson, you helped me out with bio1A and now that I need help w/ physics 4A, you’re helping me out again!! The best lecture, so clear and straight to the point! a hero doesn’t always wear a cape.
Thank you so much. This has been the best explanation of torque I've found and you presented the concept in such a clear manner especially with the wrench and the visuals. Seriously, thank you.
You are amazing professor, thanks to you I am able to pass my physics exams. thank you!
man, your quite good at explaining.
Very informative. Thank you for such a subtle explanation, i finally understood what torque means.
I've heard about torque in cars, but didn't search for what it meant; this video helped me understand the concept. Thank you! :)
Great video...thanks for explaining it simply...now I know how to read Nm values in cars !
Best explanation I've seen on RUclips so far.
DAY BEFORE PHYSICS EXAM 2020
summed up three hours worth of struggle with pre-med physics in one video, thank you omg
This is very neatly done, but you seem to have taken as axiomatic that if two 'torque' values are the same (eg 50x8 and 100x4) then the torques are equivalent, or 'balanced'. It would be nice if, at some point, you took time to justify this assumption, eg replaced the axiom by what I feel is a more fundamental one involving 'balanced forces', ie something akin to centre of gravity.
I've subscribed, you explanation is outstanding) thank you!
I love watching your videos because they are helpful. perfect explanation
thanks dad
OMFG
haaaaaaakkkkhaaaaakkkaaaa
So clear and easy to understand thank you! Other people's videos seem so convoluted lol thank you great job!
@Mr.Anderson I would thank you for this video. It made my study work very easy. Just wanted to know is there anyway I could personally contact you on whatsapp or facebook ? Thanks :D
You are amazing.
cayneallen
man this torque confused me for a whole year. Now i totally get it. thank you.
What if the system is slanted how do we calculate
Thank you so much ..
It is much more helpful .. cant thank you enough
Hello,All words which you have said,its be better to do in practice,eg bolt 10,11,2,3,4 m,m and so on its equial on T.wrench you understand what I say in practice you have to do,not to tell us maths numbers .!!
I am currently studying for my entry nuclear engineering exam, i never ever thought I would be in this position ever in my life. And yet here I am, please pay attention. You will have all your life to laugh play and be idiots but you only get this Opportunity at this age once, it’s important!
Thank you a lot for the amazing lesson,cleared a lot of things for me
doing god's work! thank u all the way from iran!
I am not from Iran
You're amazing ! I understand torque from someone who's not even speaking my own language :)) That's how good this tutorial is !!!
Am I amazing?
The best video I came across , just well explained , I dono which are those piggies woo disliked the video . Thank you so much sir ❤️
Mr Bozeman which is the best simulator for physics?Can Matlab used for better simulation?
your explanations were very clear! thank you.
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is the axis of rotation always in the middle? for example, if there was a fulcrum 40 cm from the left end of a 50cm rod, would the axis of rotation be at 25 cm?
I don't understand how does the torque decrease as you decrease the lever arm , I thought as the lever arm decreases the force applied shd be more hence the torque shd be more , pls explain sorry I'm a medical science guy so my basics in physics are not strong , pls shd some light , thank you
what does it imply if we move the block 8 metres away..why is the system balanced...and what happens when we have the door knob near the door hinge
I have questions what is cutt-off torque and peak torque can u explain...?
This guy looks like David Yost. When it's morphin time he knows he's the third one to squeeze into that blue suit
your quite good
also, 541,160 people in ap physics
The doorknob is on the outside of the door because it is more convenient, not because of torque. A doorknob on the outside is near where you enter and leave.
What will be the results if i have a power or 35 nm and the lenght is 5m then how much torque i get plz reply as soon as possible
Boss how we calculate 1-1-8 pitch 12 torque plug please let me know how ?
that means if i make bigger rotation of bicycle paddle, I can go very very fast?
Learning from youtube is way easier than hearing your teacher talk gibberish
Hi classmates!
I came down here expecting a Matrix pun... Was disappointed
2:40 Because the door could squash me if I pulled?
(Just kidding. This video is helpful for my Physics class, by the way.)
Holy cow, this video was awesome! Thank you, Sir
Beautiful work, well done!
Totally helpful
if it is sitting in space it has no potential energy then what force is acting on it in order for the wrench to have a translataional motion
Hi sir, what’s the concept of the 5.0 N*m?
Why do we put a perpendicular with r when f is the perpendicular?
I have youtube, why tf I fail in physics?!!
product of the force which is the perpendicular lever arm ,
Never knew torque before
And 1 video is enough for me now
Thanks
faqeer hasnain exactly
Why was non perpendicular forces not discussed?
You are going to get 1M subs, how are you feeling?
Your examples are too genuine sir
I don't understand why I can just pick any origin along the axis of rotation. If that were true couldn't problems that are considered in equilibrium be considered moving with another origin?
In the case of equilibrium, it ultimately doesn't matter what axis of rotation you pick, for calculating torque. You can try several examples, and you can prove it with a generalized example. You will not have a rigid body in equilibrium around axis A, and simultaneously rotationally accelerating around axis B.
In the case of a non-equilibrium problem where there is acceleration, it will matter how you establish your torques. Because the fact that it accelerates, will seem to apply a torque to the body as an inertial reaction to accelerating. It is usually most convenient to track torques around the center of mass, so that you don't need to account for this. If you track torques around a point elsewhere than the center of mass, you need a correction term to account for the apparent torque caused by the inertial lag while the object is accelerating.
THANK YOU SO MUCH, I FINALLY UNDERSTAND THIS! this relieved a lot of the stress I was having because of my upcoming test.
Good experiment
which software did you use for those animations?
thank you very much God bless you..
What is sin0 doing in torque formula?
what a great educational video... I love this
U r brilliant person ..god has gifted u a very explanative mind and voice....anyone hears that just really say...oh I got that ..that was easy to learn ...thnks again ..u r always helpful!
How does an automated door apply torque from the inside or a human limb apply force from proxal joints ? Are they calculations for that?
There is either a gear, or a piston, or other motion actuator from the motor, that rotates it outward. It is the same calculation, just with a much smaller radius.
Thanks Bozeman, wouldn't mind if you stopped torquing so much tho xD hehe
Thank you sir for your very clear and informative videos. I have a questions about the last example involving the seesaw.
After the system was at rest you applied a torque that is equivalent to the torque created by the 10Kg mass, meaning thatthe net torque on the system at that moment was zero: shouldn't this mean that the system's velocity must have remained constant; therefore the system shouldn't have moved? How come the seesaw started turning if the net torque was zero? doesn't it violate newton's first law?
Thanks again for your great videos :)
You are cracked and goated at teaching physics, saved my life. Subscribed, cheers.
thanks for the simple clear explanation...how can I know which torque should be applied to which materials or applications?
Great thanks you boss.
It's very good lesson and also too much teching techniques. Keep it up.
we know value of torque, then how we know about angle of torque just by torque
like works done as mass* acceleration*cos theta
thanks for sharing this video..watching here from the Philippines :)
thanks a lot without you I would have failed
I think your video is really good. I worked in an hardware store so i never know how to calculate or know what torque is. Thanks brother you help me alot.
Teach me how to find the fkn pivot point cuz my teacher assigns hw before learn anyhung
Great video! What's the simulation program you're using?
you should've related this, along with other, topic with a Frisbee.
What a great torque on this subject...
Thank you! You explained this in a very simple way. I love it
Headed off to aviation mechanic and engineering school. Your videos are definitely a good refresher!
How does torque work the opposite way i.e a wheel applying torque to the ground from the inside ?
Torque is applied at a gear on the axle, and opposed by the torque due to static friction from the ground. Since the Earth might as well have infinite inertia at the scale of human activity, the wheel attempts to push the Earth backward via static friction, but is unsuccessful at pushing it back any significant distance. This means, the ground acts as a "work mirror", reflecting this force and the corresponding work, back onto the vehicle
At 00:45 how would I calculate the translational motion produced when the axis of rotation is not fixed in this case?
Excellent question. The way I would solve it, is with the impulse-momentum theorem applied in both its linear and angular forms, with all arbitrary references taken with respect to the center of mass. The net linear impulse on the system will equal the change in momentum of the center of mass. The net angular impulse (i.e. integral of net torque relative to time) about the center of mass, will equal the net change in angular momentum about the center of mass. Mr Anderson keeps calling it the center of gravity, but when we are talking about inertial phenomena instead of gravitational phenomena, the center of mass is what matters. 99.9% percent of the time, these terms might as well be interchangeable.
To apply some numbers to this, consider a 500 gram wrench that is 30 cm long, with a center of mass located at 10 cm from the head side, and a moment of inertia of 0.005 kg-m^2 about its center of mass. You apply an impulse of 2 Newton-seconds, 15 cm from the head side. The change in linear momentum will therefore be 4 kg-m/s, which means its subsequent speed of its center of mass will be 1 m/s. The angular impulse, and corresponding change in angular momentum, both about the center of mass, will be 0.2 kg-m^2/s. Divide by moment of inertia, to get a subsequent angular speed of 20 rad/sec.
You take a lot for granted by either working with torque on stationary bodies, or torque on bodies with a fixed axis of rotation. It gives you flexibility in where you can use as an origin for your torques and other related quantities. But when you deal with axes of rotation that nature will choose for us instead, then you either have to use the center of mass of the subsequent system, or use corrective terms for the pseudoforce of the body's linear inertia that acts at the center of mass.
You are amazing, students in 2021 still looking up to you :)
You deserve more subscribers
I literally love you so much for this video! I didn't understand it at all, but now I completely comprehend it! Thank you!