Simple Machines: The Pulley

Jared describes how pulleys can make our work easier.

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[sarnathk]

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!

[ramellin]

This is by far the best pulley explanation video.

[rossmau]

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!

[amarjitkaur]

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

[MamaTeeHam]

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

[jarrod]

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).

[melissanippard]

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

[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 YouTube 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 YouTube video that explains how to tie knots that won't come undone.

[AlitaMee]

Thank you so much. I am 8 years old and I am able to understand this . thank you once again

[drewmyheartout]

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

[mayankbisht]

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

[Noone-xuou]

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

[inigomontoya]

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.

[visheshagarwal]

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

[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.

[aditiraj]

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

[harryligamehackingbuilding]

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

[stash]

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.😊

[FeguerFineArt]

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

[Mardoto]

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