Mechanical Advantage (part 3)

[DenitheGreat]

Omg, thank you, your 240p video helped me understand physics in 10 minutes than real life day in an entire 50. God bless you sir.

[SuperSsarab]

plz explain the mechanical advantage of single moveable pulley.plz its urgent....

[CanasianZiggie214]

Hi I got a problem dealing with windmill lifting up a weight that is 6.5 Kg. i have to build a windmill that could lift 6.5 Kg weight up to 0.75 meters up. How would you do it?

[adamaqmal]

physic

[putzycockle]

It is difficult to lift a heavy filing cabinet onto a truck. Take a ramp with a 30 degree slope, tilt the cabinet back toward the truck, to the point of balance and then just gently rock it up the ramp. One man job!

[SikhShooter66]

you are the reason im passing physics

[IrishLegend26]

hnjnnnnnnnnnnnnn,

[fjkfi9ejd]

work in cant be equal to work out. it may theoretically true but not practically...such machines are ideal or perfect machines which doesn't exist in real sense

[pacersmith]

what program u use to write and draw

[josenros]

Whoa! So in this case, the mechanical advantage is the inverse sin(theta). Physics is beautiful!

[cmcespedes2]

I understood the science behind the pulley and how the mechanical advantage is achieved, but the wedge? not so much. How can you have a mechanical "advantage" of 2 by pulling (or pushing)a weight up hill? Where is the mechanical advantage in that? It seems to me that this explanation is wrong or there's something else he forgot to mention. Imagine you pushing a cart up a 30 degree hill, there's no mechanical advantage. You push one foot up, the cart moves one foot up.

[mforum4life]

@cmcespedes2 Think of it as if your trying to lift a 100 lb block six feet in the air. It is quite a difficult task but with a 30 degree wedge you could push the block up the slant and have moved the block 12 feet total making it actually 6 feet higher than it started. In a perfect world this is a 2 to 1 advantage but due to friction it is not exactly so. Still a mechanical advantage though. For every foot you move the block, it raises 1/2 a foot vertically. Hope this helps man

[SpeedAbsolution]

@cmcespedes2

You completely misunderstood what a mechanical advantage is. It's basically to lift something with less force but takes longer time. If i move the 10N mass upward by 1 meter, I spend 10J; but if I want to use a 30 degree wedge to help me do the same thing, I spend 10J too, HOWEVER, I spend only 5N of force but takes twice the distance (thus twice the time) to get it upward by 1 meter.

[rmanandhar7]

@cmcespedes2 The force you need to apply to lift the weight is reduced using the wedge. That is what mechanical advantage really means. Think like this - You carry a 10 kg box from ground (its heavy), you slide it using a lever, you'll need less force to carry the box. Do you get it now? if not, just try and see for yourself.

[silviom1963]

Dude, pure education is what you just did. thanks for simple thinking.

[tekstylelov3r]

paint skill's, yu no has them

[dyoonu]

The mechanical advantage is NOT 1 (one); it IS 0 (zero) !

There is NO MA in your first illistration.

Actually there would be a NEGATIVE MA due to the friction losses of rope on sheave + sheave/axle on bearing.

It is also TOTALLY WRONG to refer to a " 10 newton weight ".

The newton is the SI unit for force; it is the amount of net force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

Gray

[XeadXhot]

@dyoonu Lol don't troll on terminology, his lesson is still valid and the mechanical advantage, is by a 1 times the default force retequired, or that is atleast what he is talking about.

Thanks for another great lesson khana.

[BannedLol4l]

@dyoonu Actually I think weight IS measured in Newtons (it is the force on the object due to the gravitational field). Mass and weight are different concepts.

[damongcorbett]

I just took an exam for a Chemical Operator position with an Oil Company...I wish I had viewed this video before; several questions on the test related to mechanical advantage, pulley systems, and force..I'm sure I would have answered all of the questions correctly..Great explanations!

[ShutUpFoolStudios]

search Eureka! Episode 15, explains all this in about 4:45

[sifisto]

In the video you have one fixed pulley moving a sliding pulley, decreasing the load by half. If you had two pulleys(fixed) to the sliding pulley(attatched to the weight) would the decrease in Newtons ever be less than half? Thank You.

[JaktheAtheist]

yes

[BallawdeQuincewold]

Error: It's Joules, not D*Joules. Joules / d = Newtons.

[TheKmanOfSmash]

@BallawdeQuincewold Actually, he meant to say 5DNewtons, which, if distance (D) was 1, it would actually be 5Joules, like you thought it was supposed to be. But D is unknown, so it had to remain as 5DNewtons (which he accidentally corrected to 5DJoules) where the D's would cancel out when you'd compare the equivalent Work in and out so that you could get the Force. Basically Work(in Joules)= xNewtons*Distance, not xJoules*Distance, that was the "Error."

[meruleXD]

I do not understand what you mean by the rope getting shorter... it got really confusing once it got to the multiple pulleys.

[HardCoreStrategy]

@meruleXD it cuz if you do this system you will lose 2x the speed but you will also get 2x of torque, so if you got a 10kg weght to pull, your actuly pulling 5kg, but you lose 2x the speed, so if you were pulling at 2m/second, your actuly gonna make the weight go up at 1m/second, enything clear in what i just said?

[parampmd]

is this mechanism can be useful for bicycle chain system, pls let me know am product designer am looking modify the mechanism....

[HardCoreStrategy]

@parampmd you got to remember one thing, you lose 2x the speed by doing this system

[ukidding]

wedge example (2): if the weight was carried instead of pushed, would the M.A. still = 2 (the same as when pushed)

[johniswaycool]

That's not a wedge. A wedge is two inclined planes put to gether.Good info though.

[ronn773]

On the inclined plane: Force x Distance can't equal 5 D Joules. This would mean that Force is measured in Joules. Work (in Joules) = F x D. Shouldn't it be Work out divided by work in to calculate efficiency? And, length divided by height or force out divided by force in to calculate mechanical advantage?

[xceptit]

You added the second pulley and you didn't say that it wasn't going to be attached. What made. That math isn't mine right now, but you fucked up. That rope ain't moving because that pulley was attached and the rope to the ceiling.

[thekinder901]

isn't this a single fix pulley cause i just learned this

[slownightsolongg]

wooo! metric rules. feet HA!

[slam2322]

I forgot how to set up the 3:1 scale for rock climbing. I see now how it is done, thanks!

[LOLRUREAL]

In 2nd example, he did not add the weight of the pulley, and take away and add the weight of the two ft of rope to other side. therefor it is not right.

just think if the pulley also is 10 n

[TylertheAD]

In most physics problems if the mass of the pulley.. or the rope is not given you assume it's zero... every problem in physics 1 is like this you introduce pulley or rope mass later. In harder problems.

[saysyes]

Wait. In the first example, he pulls 2x as much rope for the weight to move 1x. Isn't that 2:1?

[farmrally]

The "wheel" part of the pulley is called the shiv. Good video though

[1998skunk]

c'est de la merddddddddddddeeeee!!!!

[valsoued]

hey for the ones that said that he forgot g.... he actually did not because he gave u a value in N (mg)... he did not give u the mass...he did it right!!! this is very helpful for mcat studying!!!

[dudemansam4189]

lol ya he did

[pongman]

Darn! I should have watched this video before I applied for my patent, I could have made my invention even stronger. Oh well I guess I could modify it.

[xlwaiyiplx]

u failed

[pongman]

No I didn't. I got the patent but I'm thinking I could make it even better.

[FutureInventions]

@pongman What was your invention?

[HxXFromFirstToLastXx]

@pongman what have you invented that related to a MA, that hasnt been done?

[9kolajbertelsen]

thanks

[jack10133]

lol the wheel is the pulley..

but u have great videos keep it up :)

[danielghofrani]

Its a good video but you had better teach them using FBDs.

[Untouchable0ne]

Awesome videos!