Simple Machines: The Pulley

[@sarnathk1946]

Yo! I wish I had seen this video during my 12th standard.. All those pulley problems made me pull my hair so bad.... But this experiment makes it so clear. Well done man! Awesome! I am glad I watched your video. May you make more videos! Thank you!

[@emmanuelvebem3425]

Thanks for saying this. This is the topic that got me diffident in physics. Clearly, it was due to lack if illustrations like this. I was lost in thoughts wondering how the drawing on the board practically works and I lost the whole idea on how it makes things easier. God bless Sir for sharing.

[@madelynwiedrick5672]

My 5 grader loves it! Thanks

[@nasalimbu3078]

Weel and axle

[@adannadyeth1569]

Love

[@sigma_communitty]

Well I saw this in my 10th std..I'm lucky 😅

[@MamaTeeHam]

This is the best pulley explanation I have watched. Thank you for making home school easier for me.

[@funsciencedemos]

The FunScienceDemos Team is very glad to hear that! Our goal is to make science learning fun and easy, so please make sure to subscribe for more videos like this 😁

[@ramellin]

This is by far the best pulley explanation video.

[@Son96601]

He didnt even explain anything

[@antonioterol6790]

there is a mistake

[@jaanusristi8649]

@@Son96601 seriously

[@rossmau3895]

This is a fantastic demonstration that I am sharing with my students, since we can't do it in class due to distance learning. As a physics teacher I do want to nitpick that this isn't making the "work" easier, because work has a specifc meaning in Physics of Force times Distance. *W= Fd* In plain old English, yes, we can say it's making the work easier, but no machine or device can reduce the amount of work it takes to do something, as that would break the first law of thermodynamics. Breaking the laws of Physics is strictly forbidden in my house (and universe). Thanks for the great demo!

[@shouryaupadhyaya2036]

so why does it take less force to pull the weight attached in the pully can you please explain it to me??

[@BorutoOtsutsuki__]

@@shouryaupadhyaya2036 it's because in the 2nd one, the tension is getting applied from both left and right side whereas in the first one tension was only coming from 1 place which was applied by us

[@leandrikos2606]

@@shouryaupadhyaya2036 because work = force x distance, if you exert a smaller force over a longer distance, it will be equal to the work done when you exert a large force over shorter distance. With hydraulic systems or pulleys, the output distance is longer than the input distance.

[@amarjitkaur6283]

I love the way of demonstrating the things easier and faster. I swear couldn't understand it better from anyone else.

[@funsciencedemos]

Thank you so much for your feedback on our science video, and thanks for spreading science! Please keep in mind our channel, FunScienceDemos, has over 200 exciting science demonstrations like this one, on every important idea in science. Here is our channel link: bit.ly/16zEpWc. If you are a teacher, we would love to hear how you are using this video. Science is so cool!

[@Nameisyogesh-sh]

@@funsciencedemos sir here u should use the word mechanicle advantage it will surely ." Sone pe suhaaga"🎂= 😀love from india

[@TexasNance]

I recently purchased a pulley system to hang a bug repellent canister from the eaves of my house. The pulleys are great little gizmos, but having never rigged a pulley system before, I needed instructions, and there were none. I scoured the Internet and KZbin to find a simple video that explains how to rig two pulleys, and I finally found funsciencedemos, and low and behold, I now know how to rig a pulley system. Thanks Jared. Now, I need to find a good KZbin video that explains how to tie knots that won't come undone.

[@jaanusristi8649]

😑

[@Rip_ShadowRblx-e2u]

This guy is supposed to get more than a million subs!! He made me get an A+ on science. If I didn't watch this vid, I could have flunked my science exam!👏

[@funsciencedemos]

We are so glad you found our video helpful! Thank you for supporting the channel :)

[@sudhadixit3564]

It's so easy!!!!...... The explanation made my life easier like the pulley......this is an awesome video.....

[@jarrod9234]

Great video. The only thing I would love for you to add is the relationship between the number of ropes that are suspending the mass, and the reduction in force needed to lift it. In the first example (fixed pulley) the mass is suspended by only 1 rope, so their is no mechanical advantage. In the second example (single moveable pulley) the mass is then suspended by 2 ropes, which halves the amount of for needed. The final example (two fixed, one moveable pulley), there are 3 ropes supporting the mass - meaning one third of the amount of force needed. It would also be handy to add that the trade off for reduced for is a great amount of rope needing to be pulled out to see the same change in height. The amount of rope needed to be pulled is simply a direct multiple of the number of supporting ropes mentioned above. (ie. 3 supporting ropes = 3 times the amount of rope needed to be pulled out).

[@LukeSumIpsePatremTe]

Also there could be a distinction between a _force_ and a _mass._

[@tony17112acst]

Jarrod: Your explanation is WAY better than what's in the video.

[@onlyhumanity6148]

Nice explaination

[@sonofjimmyray]

This comment has made me understand more than anything else I have seen

[@jarrod9234]

@@sonofjimmyray I'm glad it helped. :) I wish I'd proofed it before posting it though! It's not written well. :)

[@asddwwwawd5725]

very nice presentation im on online class now in my engineering dynamics i reviewing i am confuse on some pulley problem especially when the string is fix at bottom now i understand thank you very much

[@robert2real]

Excellent demonstrations

[@melissanippard1628]

Wow I'm doing my work at home because of the Corona virus and my teacher sent me this video and it has helped me so much wow

[@fazaludeen1]

Same

[@louiechilver1377]

Charlie's Gaming and CHALLENGES!!! Same

[@PrinceSesay-t1b]

I love the teachings

[@visheshagarwal778]

I'm in 10th grade and this helps me so much... Thank you!

[@shilpagarg5015]

I like all your videos

[@Mardoto]

i'm watching this in school unlike the other videos they show us i actually like this guys videos

[@funsciencedemos]

we are so glad! science is so cool!

[@inigomontoya4109]

I think you should clarify that you are not making work easier in the physics sense. You are doing the same amount of work, just utilizing less force to do it. For example in your second example you have to move your scale twice the distance to move the weight the same distance up. This means you are doing 500 grams by 2 vs 1000 grams by 1. They equal the same work done, just making it easier for the work to be done.

[@franky01ize]

You are clearly a jack ass. So glad you will never become anything in life.

[@inigomontoya4109]

@@bishopguitars sorry if I wasnt clear. In physics work has a very specific definition, and this video actually does a great job of showing that definition. Say for example you have an object that takes 5 Newton's of force to move and you want to move it 10 meters. That would mean you need to do 50 Newton meters of work to move it that distance. A simple machine such as a pulley allows you to exert less force over a greater distance to move that object the same 10 meters. For example with a pulley I could exert 2.5 Newton's over 20 meters to move that object 10 meters. The work isn't lessened or easier than before because I'm doing the exact same amount of work. The difference is I'm not needing to use as much force thus it seems easier from a practical point. Obviously for the weights involved in the video you could just pick them up and move them, but when your talking things that exert more force than you can physically being able to exert less force over greater distance becomes a great advantage.

[@Naxhus2]

@@inigomontoya4109 I understand what you're saying - the presenter is using the term "work" colloquially, not in a scientific context, and saying that "work is easier" in a scientific sense is wrong (because work = force*distance, and doesn't change). A more precise way of saying it is the same amount of work requires less force but twice the "distance" (rope pulled). If you need to lift a 1000g weight 1m in the air, you can either do that by using the one pulley arrangement and pulling the rope 1m with 9.8N, or by pulling 2 m of rope with 4.9N. So what he's saying is "work is easier" to the layman, but scientists would say "work requires less force".

[@austin16377]

inigo montoya Yes, work is the same. The person used less force, but the other pulleys made up for it.

[@tree490]

Thanks a lot for this comment! W = f x d remember people

[@firefoxgaming6152]

Definitely going to help me with my science test. Thanks so much!!

[@ThatGithubGuy]

same!

[@shivanshuudeniya3338]

great explanation

[@harryligamehackingbuilding2556]

Really thanks for the video. My first language isn't English and my physics is not very good, your video really made my English and Physic subject skill better. Once again , thanks so much

[@funsciencedemos]

Hello, and thanks for your comment! You can easily translate the subtitles into your native language by first turning on the English ones and clicking auto-translate, then selecting it from the drop down list. Science is so cool!

[@harshini1210]

WOW! It is a very nice example to understand simple machine.When my mam explained I had small doubt but after watching this it is clear.THANK YOU and LOVE YOUR EXPERIMENTS

[@funsciencedemos]

So very glad to hear it. Thank you. For more fun science demos, please subscribe to our channel.

[@MSJChem]

Great video, very clear to follow.

[@funsciencedemos]

We love to hear that! Don't forget to subscribe and tell your friends and co workers about us!

[@parneetsangha4248]

Ok thank you so much for the follow I love you

[@dragonblast2428]

sorry i can`t so sorry but your amazing

[@Noone-xu2ou]

Crazy Dogs 1 year ago This is by far the best pulley explanation video.

[@drewmyheartout6309]

These kind of videos make learning science far more interesting than the science 📚 books do. Thank you funsciencedemos....

[@funsciencedemos]

Glad you enjoyed it!

[@KarateCritic]

Excellent video and very well explained.

[@funsciencedemos]

Thank you so much for your feedback on our science video. And thanks for spreading science! Please keep in mind our channel, FunScienceDemos, has over 150 science demonstrations for every important idea in science. Here is our channel link: kzbin.info. If you are a teacher, we would love to hear how you are using this video. Science is so cool!

[@mayankbisht7691]

In case of a simple pully, you can use your own weight as force, hence, it makes work easier. In case of a moveable pulley, it really does half the required force because the other half is handled by fixed string

[@AB-nr8uq]

This completes the above video, its a very important note while explaining pulleys...…

[@jerrysmith9780]

Science IS cool and so interesting when explained the way you do it. Thank You. P.S. The block&tackle you showed would make our work 6x easier, correct?

[@funsciencedemos]

Glad you enjoyed it!

[@Traplock1]

Where did you get those pulleys?

[@DanBlabbers]

A good point to make is that it is not about the number of pulleys it is about the connection points that are fixed and count as another helping hand in the force lifting the object

[@vzeinaa]

Thank You So Much this helped me with my study!!!!

[@kirsteinpretorius6002]

Thank you so much for this! I will show this to my students to help them in class.

[@funsciencedemos]

Glad it was helpful!

[@Curtis_Fu]

wow this is really informational. im gonna add some of this information on my work

[@stash.]

block & tackle pulley! no kidding i'm a science newbie but you helped a veteran amateur digger out big time Thanks for the tips. :)

[@funsciencedemos]

Thank you so much! We love the positive feedback. For more videos like this one be sure to subscribe to our channel at kzbin.info !

[@aditiraj1505]

oh my god you are seriously the best one. have no words the explanation the examples were just out of the world. wow just wow. no words can describe it. gosh loved it just wow

[@youkontotube]

Just to specify. The work you have to do to lift the weight a given distance is not LESS using a pulley system than just a straight rope. However, depending on how you have defined EASIER it might be just that. But to lift the weight 10cm above the ground takes exactly the same amount of work (assuming friction free pulleys) whatever number of pulleys that you are using. If the pulleys are not friction free it takes even more work to lift it those 10cm using pulleys.

[@newbee5264]

CONGRATS ON 100K SUBS!!!

[@jth5542]

Great work number one.

[@jaynicolosi8659]

I get it, nice.

[@blackqubegaming]

thx im in year 6 ( grade 6 ) so it helps me alot

[@kabtenmohamed2734]

very good

[@itaimoscovitz184]

jared you are hte best!

[@FeguerFineArt]

Great video, and thank you so much for including the flag at the end!

[@deestevens-cdps2090]

Archimedes used a system with three pulleys that accomplishes the same reduction in force as a block and tackle with six pulleys. As your example of where you connected the first pulley showed a difference in force, the arrangement of three times that same principle helps more. Three pulleys in a row, connected to the cross bar, from the cross bar through the first pulley then connected to the bottom of the next pulley. Repeat three times then through through a fourth hanging from the cross bar the the source of pull. Either a person or a winch.

[@Fishyflabs]

I can imagine kids ripping on this video but I'm sitting here as an adult trying to apply it to real life lmao yea.

[@stash7650]

Thank you so much for this video, I thought hanging a canoe from my garage rafters would be simple...nope. This helped tremendously, I was so happy when I gave that first pull and it finally worked. Again thank you so much for making this.😊

[@codyjacoway2885]

This is awesome. I just wish you could explain the difference between the first example and the second example better. Why does one pulley at the top make such a big difference then the pulley attached to the weight?

[@Snowy0123]

One of the best examples of the amazing world of pulleys..

[@hjd832]

Great, very well demonstrated..thinking of buying a block and tackle for my stairwell to help taking stuff up & down stairs....

[@lydianewell510]

Very informative its makes pulleys more understandable for me! Thanks for the video!

[@funsciencedemos]

we are so glad to help!

[@lakshietagupta6595]

This is NOT boring

[@funsciencedemos]

Thank you so much for your feedback on our science video. And thanks for spreading science! Please keep in mind our channel, FunScienceDemos, has over 150 science demonstrations for every important idea in science. Here is our channel link: kzbin.info. If you are a teacher, we would love to hear how you are using this video. Science is so cool!

[@Kam16665]

So clear! Thanks,mate!

[@Truthbomb918]

Ancient, simple and so effectively

[@mukeshyadav-qp1yq]

Very nice concepts.

[@MukeshSharma-il9yp]

Great work dude I was struggling with this in physics but this made it easy Thanks

[@funsciencedemos]

Glad to hear that! Check out our channel for more physics demonstrations :)

[@crucial_0142]

It is the best video for understanding

[@haroonahmedchaudhry1077]

very informative. Thank you

[@funsciencedemos]

Glad it was helpful!

[@liviagrace4194]

My teacher always requests to watch you!!

[@fritmore]

It should be pointed out that the more pulleys one uses to lift the longer stretch of the rope needs to be pulled for the same lifting distance.

[@funsciencedemos]

Thank you so much for your feedback on our science video. And thanks for spreading science! Please keep in mind our channel, FunScienceDemos, has over 150 science demonstrations for every important idea in science. Here is our channel link: kzbin.info. If you are a teacher, we would love to hear how you are using this video. Science is so cool!

[@jokinggamerph1026]

What kind of pulleys did you use?

[@dharmendrakumarsingh9757]

Thank u sir for explaining every topic in fun way , with experiments in every topic . You explain very very well .... Thank u very much for that

[@mahbagh9956]

is a swing device lever or wheel-axel?

[@sovietunion3721]

Nice and simple video 👍 It helps me understand alot

[@CoolKlipz2.0]

Thank you so much for this!!!

[@monchobi1910]

very nice experiment !!!!!!! understood at once

[@user-zk7dq6hf3z]

useful video

[@ghostface5559]

the hum is caused by not getting accurate room tone, and the mic is too sensitive. my advice is to just adjust the high or low pass or tune the sensitivity down. idk. but great vid wish they had this when I was in school.

[@nathanielyang3474]

Your video is so informational!

[@_vinvin_vince]

this video taught me a lot : )

[@Obitwotwo]

Great job! You should probably mention how you have to pull further distance because of the conservation of energy law

[@crazybill59]

sh

[@moaaqib4235]

nice and helpful video

[@anushkamishra7219]

great demo!!!

[@tombrady5982]

I know right

[@Flexasnipe]

What is the dependant, independant, and controlled variable in this experiment

[@vaseemashraf3974]

I kinda like this guy. He is so cool like the science...

[@funsciencedemos]

Thank you so much for your feedback on our science video. And thanks for spreading science! Please keep in mind our channel, FunScienceDemos, has over 150 science demonstrations for every important idea in science. Here is our channel link: kzbin.info. If you are a teacher, we would love to hear how you are using this video. Science is so cool!

[@stormnr2]

is it possible to make things harder to pull like double the weight by rearranging the pulleys? so i dont have to pull as much rope but pull more weight?

[@1cont]

Yes! Rig up everything with 5:1 mechanical advantage. Then when you are all set up tie your load to the rope you were pulling by hand and pull on the bottom of the movable pulley and you will have your distance of rope taken up 5 times as fast as the distance you pull the movable pulley.

[@gronaksingh1438]

saw the video was awesome!! :) the concept is clear keep it up!!! :))

[@funsciencedemos]

Thankyou! For more interesting and fun demonstrations, please subscribe to our channel.

[@ryryplayz665]

this helped me alote

[@christianfatouros901]

too bad it did not help with your spelling :)

[@asifshah1411]

Good now i understand in this topic of pulley

[@chewbaccawookie4853]

so cool

[@pavithraNarasiman]

when we pull the weight at different angles whether it makes the work much more easy

[@nirajbk5395]

very well explaines... but the subtitle box is too big it just hide the content and its very annoying... as you add a new pully each time... it is difficult to understand how pully is fixed on weight.

[@maala3775]

Thank you 🙏 sir your explanation is excellent

[@Sachin.Mishra55]

thanks bro🤟 super excellent explanation 😎👌👌

[@funsciencedemos]

You are welcome! For more fun science demonstrations, please subscribe

[@Sachin.Mishra55]

@funscience subscribed bro👍

[@bgmeadows6085]

I use a riding lawn mower pulling a sweeper (grass clippings catcher). I have a rope attached to the sweeper so when it gets full, I can empty the sweeper without getting off the mower. One BIG problem: when the sweeper is at capacity (and since I'm 60 years old) I can only hardly empty the sweeper by pulling on the rope. Well, that's when I thought a pulley system might work. However, I'm at a loss as to how to set it up. Do I attach the pulley to the sweeper or the rear of the mower seat? Or the other way around? I'm thinking I may need to use a double pulley system since I'll be pulling horizontally and NOT vertically. Any suggestions?

[@daviddaiker9400]

Tie the rope to the mover, put the pulley on the sweeper, pull the end of the rope from the mower. The force required to dump the sweeper will be cut in half.

[@Glugmich]

Great videos! Maybe use a little more specific vocabulary terms like 'friction', 'load', or 'mechanical advantage' sprinkled in would add some much needed common reference for students here and across your video series.

[@funsciencedemos]

Great suggestion!

[@samanthasaunders8495]

When multiple pulleys were put together and used to lift the weight what was the measure of doing this work?

[@0Tirano]

Can I use this system to pull a vehicle by myself!? Knowing that the force that I will apply is not up or down, but from one side to the other, is it possible!? puedo usar este sistema para jalar un vehiculo yo solo!? sabiendo que la fuerza que aplicare no es para arriba o abajo, sino de un lado a otro, se puede!?

[@yaboi3370]

Thanks for help with my engine hoist

[@andrewsager5676]

Great vid love the enthusiasm

[@trentkruger2921]

This really helped, me thank you so much

[@xforney]

Can you provide me with the name of the stainless steel stand that you are using to demonstrate your pulley experiment on? I would like to purchase a stand like that to demonstrate on.

[@johnmelon45]

You should include some vector diagrams

[@Adityasingh-om2jp]

Very nice and good

[@Chaudhary-concrete]

i am thinking to use this pully to lifting cement block use of pully make easy to lift up block pallets

[@manojgamingyt226]

You made it easier

[@gurmailchanddhimandhiman6968]

Great Video thanks

[@beastboy7327]

Thank you very much

[@trickshoters.2624]

Thanks for the video I got a 98 on my midterm

[@funsciencedemos]

Thank you so much! We love the positive feedback. For more videos like this one be sure to subscribe to our channel at kzbin.info !

[@fpchauvette9664]

Still only a matter of perception. 1. Three things changed in your system. 2. The spring scale is inverted so of course, the measurement is going to appear to be less because you are pulling from the opposite way. 3. The pully is removed from fulcrum, and added to the weight, and your personal weight is no longer putting force on the spring scale, but only suspending the combination of the pully and the weight. Therefore, the pully is not part of the fulcrum, but part of the weight, and the force is no longer under pressure, but in suspense. The hand in suspense tells the truth that the work is made more difficult in the configuration of the pully attached to the weight, and that is supposed to be the importance of your demonstration, not shifting the importance of the work the pully does over to how much the weight weighs. It is much easier to push than pull, but that does not mean that the pully doesn't make the job easier in the proper application. Is it easier to push or pull a cart? Pending weight distribution, I personally prefer to pull the cart rather than push the cart, but I'm certain your preference of mode is rather push than drag.

[@Slouworker]

Can someone explain how reversing direction of the pulley at 3:16 lessened the force necessary to move the weight?

[@vishnumohan2363]

thanks so much my head couldn't get around it keep doing what y'all r doing

[@cssanto]

Where can we get pulley?