Ice accelerating down an incline | Forces and Newton's laws of motion | Physics | Khan Academy

[@thedogdogification]

I can't believe how much sense this is making to me now, after being utterly baffled by it back in college.

[@Henryharveyharold]

Nearly cried with happiness when I could finally answer the question in my as physics book! Thankyou, I couldn't find this information anywhere else

[@sharifsircar]

I know the feels

[@XxjLuma94Xx]

omg physics is finally starting to make sense!!

[@JBoyle-jr9wb]

if my physics professor would ever turn around and talk to us, he might notice everyone is requiring a little explanation in the form you do, not just jousting with a white erase board like he's discussing things in a cern board room.

[@marghoobhaider5014]

Suppose a trolley having an inclined frame the angle of inclination with respect to ground is 30 degrees. The trolley is moving on a straight and uniform road. Does the inclination of trolley’s frame can provide the advantage of gravity in our favor. The net weight on the axels of trolley is 100 kgs and is uniformly distributed.

[@DarrylPilar-r9r]

this is beautiful, now that im doing the course its all starting to make sense

[@alexpeterson58]

First you are adding vectors improperly, which is why you ended up with a value greater than the original gravity value of 9.8 m/s2. Check up on adding vector quantities again. Second one of the directions is countered by the ground, just like when you are standing on the earth you dont accelerate. The direction parallel to the ground is the only direction it can go (it has no countering force), which is why this value is the one we use

[@Aelfraed26]

Very good explanation. Once you understand this you can simply multiply g by the sine of the angle. 9.8*sin(30) = 4.9

[@A591m]

test next week and these videos are literally saving my life since my prof goes too fast and my note taking can't keep up

[@MrSwaagar]

Shine bright like an ice block

[@ryan4793]

i would say you much better than my physics teacher

[@squishycommander]

God Bless you, good sir!

[@theultimatebeast6597]

Why isn’t the normal reaction opposite direction to the weight of the block ?

[@VH33GOAL8]

wow this is just wow thanks Sal for this tutorial n all Ur work you really twisted my attitude toward physics course

[@AmazingTNT]

Studying for the MCAT and still can't figure out physics for the LIFE of me. Thank you for your help.

[@chongalongg]

@bubbleteddies most pen tablets allow you to hover the pen above the pad to move the curser.

[@BashirArsine]

Just love it here. Keep up!

[@husseinhayek3945]

If accelaration is 4.9m/s^2 the what will be the velocity??

[@stitchlilo2493]

Thank you soo much, I grinded with my book for an hour trying to decipher why they chose to randomly use sine and cosine for the components of gravity (they would give examples but no explanations ?) This got me working in just a couple of minutes.

[@shrutiprabhash3948]

thanks for that its cool

[@Verschlimmbesserung]

The force keeping it in a static position would be friction, or the force acting in the opposite direction to that of the acceleration. It would have to be > or = to that of the force parallel to the plane.

[@fleshcookie]

Physics is kind of beautiful. Amazing the wealth of knowledge you can ascertain given such little information. Thanks a lot Sal, I'd kind of liked not liking physics.

[@shad0wfaux]

Shiny like ice is shiny!

[@Preeti1630]

OMFG THANK YOU SOO MUCH!

[@turcugeorge5874]

It'd be amazing if you could make new videos of vectorial calculus(grad,div, curl) like you did with vectors and all the basic science

[@iaminvisible5659]

Appreciate it sal!

[@akshaykamath7719]

as it is tld tht the knowledge tht we gain in our life time is the only wealth which never let us down,and for me u r my wealth.

[@vrdesk]

love ice

[@gowrishankarkn1465]

super helpful stuff

[@akshaykamath7719]

yes ,gd idea

[@EngnrIdris]

U R awesome buddy

[@Openproject100]

I don't understand. If you split up the downward force of gravity into the perpendicular and parallel forces then wouldn't that be 49N perpendicular and 49N parallel? Because 49n + 49 sqrt of 3 = 98 sqrt 3 and that does not equal 98N for the Fg vector.

[@drofeng]

Negative, the magnitude is 98N i.e. sqrt ( [49 * sqrt(3)]^2 + 49^2 ) = 98 N , regardless of what coordinate system you use.

[@maramalharbi2159]

ok so the acceleration is minus? or +ve? bcuz i know that a= g sin theta but sin 30 or whatever will always be +ve cuz it's

[@seanhaight2551]

Can the normal force exerted by the inclined plane be broken into two different vectors like the force of gravity so that part of it will accelerate straight up and part parallel to the plane

[@mathman42point4]

Hey Sal, did they have Anna's Taqueria when you went to M.I.T.?

[@haiderriaz8957]

correction: negative "g" means 'upward' and vice versa.

[@walperstyle]

COS 30 x 98 = 84.87049.... Normal Force = 84.87049.... get rid of your ancient hieroglyphics.

[@not_nein6801]

this physics stuff is hard im only a freshman bro

[@maxpayyourtax6602]

is gravity 4.9 or 9.8

[@drofeng]

9.8 m/s^2 near the surface of the earth

[@maxpayyourtax6602]

@@drofeng I was a bit dumb of a dude back then, i know 9.8m/s^2 is the acceleration of gravity. I just confused it with its antiderivative (position part) 4.9x^2

[@tttuu3309]

Why y didn't take about th sign .t move up and down??=?

[@jetpaq]

LOL!! Wish id have said that..2 tru.

[@Gazunklenut]

@bubbleteddies he's using a touch pad and a pen :P lol

[@noordinaryzoot3722]

Anyone else here because the physics professor is to busy to notice you struggling?

[@MultiApodyopsis]

he can speak other languages besides from english, afterall he isnt white

[@beckysmisery.9769]

Waj B ignorance alert.

[@LeekyBo]

Why can't you be my Physics teacher Khan?

[@bjoernofsweden126]

***** Why can't you be his student?