Scopul acestei lecții este de a explica cum funcționează bărcile cu pânze prin explorarea principiilor de bază ale fizicii. La sfârșitul acestei lecții, elevii vor fi capabili să identifice forțele care acționează asupra unei ambarcațiuni cu pânze și să explice modul în care combinația acestor forțe are ca rezultat mișcarea înainte a unei ambarcațiuni cu pânze. Elevii ar trebui să fie familiarizați cu vectorii și să-i poată folosi pentru a reprezenta forțele și momentele și, de asemenea, ar trebui să fie familiarizați cu utilizarea diagramelor cu corpuri libere pentru a reprezenta forțele și momentele. O înțelegere de bază a fluxului și/sau rezistenței fluidului ar putea fi utilă, dar nu este necesară. Această lecție și evaluarea ulterioară vor dura fiecare aproximativ o oră. Elevii au nevoie doar de creion/creion și hârtie pentru a finaliza activitățile din lecție, deși o activitate opțională în care elevii își fac propriile bărci cu pânze ar necesita materiale suplimentare. Provocările activității de la clasă sunt centrate pe discuții în grupuri mici bazate pe întrebările puse înainte de fiecare pauză. Diagramele corpului liber sau o altă reprezentare conceptuală a răspunsului său ar trebui să sprijine soluția fiecărui elev la întrebările puse în videoclip. Instrucțiunile pentru opțiunea de a pune elevii să-și proiecteze propriile bărci cu pânze ca parte a acestei lecții pot fi găsite în Resurse pentru profesori. Atenție: ni s-a subliniat că anumiți experți nu sunt de acord cu explicația pentru generarea ascensorului prezentată în această lecție video. Din acest motiv, dorim să trimitem spectatorii la următoarele articole care prezintă o explicație alternativă: http://www.gentrysailing.com/pdf-theory/How-a-Sail-Gives-Lift.pdf https://www. .northsails.com/sailing/en/art-science-sails/gentry Pentru mai multe informații: http://blossoms.mit.edu/videos/lessons/introduction_physics_sailing
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O introducere în fizica navigației
37 thoughts on “O introducere în fizica navigației”
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On a technical level it’s very interesting. But really, i fell asleep
What do I do with my hands?
I always thought yachts more or less got sucked along, not blown along.
MIT? Not the right explanation. Dang.
Great video. Thanks! Were the Tech Dinghys replaced? It's been a long time since I sailed at MIT. Course III, '81.
good video , you now have 1000 likes:)
I know she's right, but my cranium exploded about 6 mins into the video. LOL I should have planned to watch about 2 mins of it a day for 8 days so as to keep that from happening.
Thanks for sharing, very useful and helpful.
Nicely explained, but perhaps there was too much emphasis on the lift from wind blowing over the profile shape of the sail in exercise 1. Those lift forces would be very minor compared to the force from the wind directly on the sail surface and countered by the daggerboard, keel and rudder. This is evident through camber-free sails as can be seen in some windsurfers and in the example where you tried to sail without the daggerboard. I am bringing this up as some people believe that the force which allows one to sail upwind is primarily from the profile shape of the sail…which is incorrect.
Great video Emma!
Great video! As a novice sailor and a person who HAS to understand how things work in order to remember them, this video is perfect. Thank You!
According to NASA
https://www.grc.nasa.gov/WWW/K-12/airplane/wrong1.html,
the explanation is wrong. And this video proves it,
close-hauled motion with no wind on leeward side:
https://www.youtube.com/watch?v=jhem8Z9ujPE&feature=emb_logo
Anyone know the model of dinghy she is sailing?
You remind me of Abby from the Last of Us Part 2
I’d love to get my little girl out with her for few weekends. That way I could ask her questions later. I bet she could do a great sailing class! Rather than the basic physics/math vid. Great job! Smart young lady.
Beep boop
What fun! I'm thinking about an autonomous RC Sailboat. Fascinating problem! Great guns btw, result of hauling in sheets.
Feed the Geek!
Noticed this was some 3yrs ago. I'd love to know what the young lady is doing now.
They don't teach spelling at MIT.
I looked at your eyes the hole time!
i just wanted to learn about sailing but ended up just staring at the pretty girl the whole time
i guess there is no easy way to understand this.
thank for the lesson… really great explanation….
Thank you I'm William Elica & I'm planning to voyage from lat 20° north longitude 121° east. To Sydney , My late father the best friend of American coastguard here in Batanes island Philippines ,Thank you white Americans to give me reference
Nerds rule. Nerds make the rules too. : )
This would have been very helpful information to have watched before I tried and failed after buying my first sailboat up in New Jersey, but we live and learn. Keep up the good work thanks.
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Why is that sailboat model so beat up? and its got a wood screw for the front bearing lol
When will not keel the mast and headsails to sail upright and faster? Stem to stern keel line or wing keel and blade keeled head sail. What if you keel the mast accurately at the mast and remove the unkeeled headsail?
The keel is in the wrong place. The keel should be at the mast. The following edge of the keel matches the following edge of the mast. This on keeling.
The surge of lift is greater than the power of jamming.
The force vector ratio from width of the boats is the trimaran and catamaran design. A catamaran should be built in have a force vector ratio that is three to one. HtoV. The horizontal force you can capture before the boat heels and you lose wind power.
Can you slow down please? Maybe telling people what they need to do first and explaining "why" later for people with very little physics experience.
When it comes to demonstrating the effect of the force created on the profile in a stream, I prefer an ordinary soup spoon with its convex surface close to the stream of running water coming out of the tap. You can see and feel it. No appealing to Bernoulli's law or looking at the wing of a jet-powered airplane.
It could have been a very instructive session howevber it isn't as you do not dwell long enough on the earlier examples. The outcome of that mehod is almost invariably that
watchers think they understand…but soon afterward they forget. To assimilate knowledge takes time and true conciliation with all details.Even the explantion of 'lift on an
aircraft wing was truncated….the concept of lift frrom the keel was rushed through. That makes it seem like some religious spruiker rushing one to donation point by a
sort of mesmerisation.The proximity and shap of sails is also important in 'movement'…I wrote this at your 13:51 so now will see-out the rest.
Exactly what I was searching for. Thanks
unpopular opinion : very confusing and overstuffed presentation .