Friction on an inclined plane
Calculating the acceleration of on object sliding down an inclined plane with friction.
As promised, we have imaged the brain of YouTube’s favourite professor in this video about how MRI works. More physics at www.sixtysymbols.com
Video Rating: 4 / 5
amazingly you’ve helped, yet at the same time confused me.. who woulda thunk!! THX
I’ve calculated with variables, and as is the case with no friction, mass does not matter here. Acceleration perpendicular to the plane is always a_g(sinA-u*cosA), where a_g is acceleration due to gravity, A is incline angle, and u is coefficient of friction.
@Utaken friction is always against the direction of motion
Thta’s because most students fuck around in class!
Your videos are amazing! Thank you so much. I wish I knew about them when I took Gen Phys I.
So many teachers are old and dumb, I wish teachers would be harder to hire and I wish they get paid more so people like you would consider working as one, specially as a physics teacher.. sigh, PS. I learned more from 10 mins of a youtube video than 120 mins in class with a dumb ass teacher, I don’t do math well but I’m pretty sure that’s more efficient
PLease make the videos a bit faster. pls pls pls.
Can F_friction be greater than F_parallel? Would it move up
?
O_O THANK YOU SO MUCH!!!! i didn’t understand ANYTHING our teacher said and then bam, oh there’s khanacademy! ^_^
@turnerhare
on a smooth plane (frictionless) no it doesn’t effect it, like in freefall.
but im unsure on when there is friction, though i imagine it would:
as different wieght would mean different normal reaction force. and friction is proportional to the normal force. (then more friction = smaller resultant = smaller acceleration)
can anyone confirm that?
you should now that when a triangle have 30, 60 and 90 degrees the length of the sides are always (the opposite length of 30 is always “K” , the length opposite to 60 is “K square root of 3″ and the hypotenuse is “2k” this helps and there are lots of them like the 45,45 and 90 and the 37,53 and 90 that makes your problems faster
@paulojunior201: It takes 2 seconds for him to say it, it helps people who may have trouble remembering and it’s not harming you.
May I make a suggestion? If you don’t like his methods you could not watch the videos, you could watch one of the countless other videos on this subject there are around the Internet, you could make your own if you are smart enough to. What you don’t need to do, is whine on every video that he mentions the trigonometry mnemonic.
Hope I helped, ta ta.
wtf is one half…..?? its simply half isn’t it..?
thnxz ull save my life
sohcahtoa again. geez
Hey, guess what, my physics teacher does the same thing, except he gives us a worksheet and writes on the board the next day and decides to be absent the day before the exam…yay!
Not sure what you did but I get this stuff now…great video.
I love you.
I have a test on Wednesday on this, and I was about to cry last class because my teacher explains NOTHING.
But now I feel a lot better, lol.
yay fun physics is awesome guys…
you just made my life easier a whole bunch!
my physics teacher is I guess worst teacher. I wish you were our physics teacher. My teacher just keeps on writing in the board without detail explaination.
When my teacher taught this portion of physics, at that time I didn’t even got the idea what the component of gravitation opposite to normal was.
Great stuff. I think the “y-component of gravity perpendicular to the ground yada yada” idea would be simplified if you included a set of coordinate axes along the slope of the inclined plane. Then again, what the hell do I know?
yeah same here, except I was absent from class and all I got was a list of a bunch of equations, I was lost as hell. haha
I’m glad i found this video though
wow what a teacher- he really break the concepts down i love it- i didnt understand what the hell my physics teacher was talking about and today i found this and it saved the day
why not just use cos of theta?
Why isn’t she wearing scrubs?
@odysseus9672 and @arcarulez Actually, yes it WOULD, although odysseus is right that it would tend to be pushed out, but only very slowly at 7T I would imagine. Look at this, it’s only 1T!!!
watch?v=lszHhU52Mow
@10mintwo You would actually need to put it in some kind of slot, otherwise the block will be pushed sideways out of the field, I would think.
Oh, professor! Your brain is so big and foldy!
I’m jealous!
j/k
@vrshowdown joke was that since he’s a professor/scientist guy and brains are called gray matter that his “gray afro” was just his brain cause its huge an all…something like that kinda lame but what ever
@nemesisnick66 looks like a gray afro to me
@Muscleduck Same here, and im just like the professor a chemist
the chemistry professor on my university (amsterdam) is also a lefty
that isnt hair on his head its gray matter!
I’m a lefty too! Is it me or are some of the biggest brains left handed… The Professor, Einstein, Picasso,…
his lateral ventricles (‘space’ inside ones brain, in which cerebrospinal fluid is mainly produced) seem to be comparatevely small – so there’s more room for gray matter
Can you tell that I’m left handed by looking at that? LOL!
@Serostern: Proffessor’s name is Martyn Poliakoff
Would be great I think
I wonder if anyone framed a printout of one of the cooler images so the Professor could hang it in his office.
Hmmm, chemistry and physics are represented. I wonder if there will ever be Math Dept. videos?
@mikez565 – Perhaps because she’s American…
Anyone know the professors real name?
I have been in that exact MRI scanner! Found it to be like just like the video says, it made me slightly dizzy getting pushed in and it was loud for a long while. FYI the dizziness is allegedly caused by the fluid in the ear canals, which is in loops, getting movement induced into it as one’s head travels through the magnetic field.
lmao
your brain is actually split up into 2 hemispheres, they are separate entities attached by a small inslet of brain matter called the corpus callosum
i think he means the white one
BIG GRAY AFRO DUDE
she was cute
why does the girl have an american accent?
The little gap thingi between the 2 halves of the brain
?
what’s that line at 1:58 ?