AP Physics C: Rotational Dynamics Review - 1 of 2 (Mechanics)

[@gi3484]

You are the reason I am passing AP Physics...thank you!

[@FlippingPhysics]

No, _you_ are the reason you are passing AP Physics, however, I am _helping_ you to do so. Congrats!

[@jacobfritz4882]

Oh god the exam is in 10 minutes. Thank you flipping physics for giving me a chance at something better than a 2

[@katieshirley7468]

it's 2:38 am and the exam is in 5.5 hrs. I did this last year with AP Phys. 1 and now with AP Phys. C... I guess I'll never change

[@nidhishsharma9471]

Katie Shirley how’d it go?

[@frankseely5461]

WE NEED AN ANSWER

[@ldmont1185]

Same it’s 3:13 am let’s get this shit

[@thelookingcat]

Ouch same today

[@jacoboxpandazz4818]

I feel this

[@mr.sorrow8025]

Thank you for making this. I was sick the whole week before my rotation test, I could not postpone it and this video really helped. Great job

[@FlippingPhysics]

You are very welcome. I hope you are feeling better and the test went well!

[@alieser7770]

I'd hug you if I ever saw you in person, you are a real life saver!

[@FlippingPhysics]

And I’d run away yelling “COVID-19!!!!” But the sentiment is much appreciated. 😀

[@sensen9235]

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[@FlippingPhysics]

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[@loganunger2405]

Perfect review for the AP Physics C test

[@meirschochet3525]

I was about to sit down and do some practice rotation FRQs and watched this video to get me ready. Thanks so much!

[@colewelcher926]

Thank you for your help i was so lost during my rotational mechanics chapter and now I am ready for the test.

[@FlippingPhysics]

I hope the test went well!

[@Cakesok]

this is really great and all, but my only question is why does the & symbol above his head jump back and forth at 17:55 ?

[@BRYDN_NATHAN]

thank you 👍 great camera super editing excellent class participants

[@suneethaproductions204]

best revision course. love from INDIA (IIT JEE )

[@taaaaaaay]

Came back here after 3 years from graduating high school. Im in uni now. This brings back so much memories!

[@FlippingPhysics]

Wonderful!

[@jonwoods5820]

why am i just understanding how to calculate moment of inertia with 14 hours till my ap exam

[@potatooflife8603]

Found this extremely helpful, thank you!

[@FlippingPhysics]

You are welcome!

[@Amine-ol8ee]

You are a life saver! Thank you so much!

[@FlippingPhysics]

Happy to help!

[@ishitapadhiar1325]

Hello I find your videos extremely helpful and was wondering if you could make a playlist of old E&M related videos (I'm assuming that you won't be able to make a formal new review as you are for Mechanics).

[@FlippingPhysics]

You are correct that I will not have time to make E&M review videos before the 2017 exam. I am planning to make them after I finish up the Mechanics ones, however, that most likely will not help you out. Most of my E&M videos are in-class lecture videos and are located here: www.flippingphysics.com/calculus.html Some are located here as well: www.flippingphysics.com/ap-physics-c-review.html Assuming you are taking the AP Physics C Exams. Good luck in May!

[@Cyanocritta]

14:09 FRC Represent!!

[@FlippingPhysics]

Absolutely. I love FIRST.

[@joshsmith2083]

im a ftc normie but i got it

[@jemmatenenbaum6562]

My people!

[@inuyasha11p]

@Flipping Physics quick question? Should i go over the AP Physics 1 videos before this or are they same with only the calculus part being extra. Thank you in advance

[@FlippingPhysics]

The AP Physics 1 and AP Physics C: Mechanics curriculums have a lot of overlap, however, they are not the same. If you are studying AP Physics C: Mechanics, I would recommend using my AP Physics C videos and not the AP Physics 1 review videos. flippingphysics.com/ap-physics-c-review.html

[@danielkwon3062]

Thank you for keep helping me... :-) First Question is...(sorry for keep bothering you) ------ if the density is not uniform, does that mean we cannot use the Parallel Axis Theorem? --- For the Parallel Axis of Theorem, if there is a problem using this Theorem in the Test does it clearly say that the AoR is located "outside" of the rod (for us to realize we have to use this Theorem?)

[@FlippingPhysics]

If the density of the object is not uniform, you cannot use the Parallel Axis Theorem. You use the Parallel Axis Theorem to find the moment of inertia of an object at a point which is not the center of mass of the object, assuming you have the moment of inertia of that object about its center of mass. Note: The new point does not need to be outside the object, just not the center of mass.

[@carultch]

Uniform density is not strictly required for the parallel axis theorem. The conditions that matter are: a) that a rigid body represents it well enough, b) that at least one of the axes involved, passes through the center of mass, and c) that the axes are parallel. The most common mistake when thinking one can use the parallel axis theorem, is an attempt to applying it between two axes where neither of them pass through the center of mass. As an example, a thin rod, 1 meter in length, with a linear density of 0.1 kg/m at the far left (the origin), and a linear density of 0.2 kg/m at the far right, that varies linearly with x-position. A material that might do this, would be a resin poured around varying concentrations of sand. The center of mass (c) occurs at 55.6 centimeter mark, where x=0.556 m. Moment of inertia about the origin, Io = 0.0583 kg-m^2. Calculate it about x=c thru int rho(x)*(x-c)^2 dx, and get Ic=0.012 kg-m^2. Use the parallel axis theorem, Io = Ic + m*c^2, solved for Ic, and we also get Ic=0.012 kg-m^2.

[@davidosae234]

Where can l get registered, l am from Ghana.

[@Mainline100]

So how do I apply a pulley with mass to a problem, other than knowing the tensions are different? Do I have to factor in a force from the pulley, including its moment of inertia?

[@FlippingPhysics]

I would suggest you watch my in class lecture. Should help: kzbin.info/www/bejne/aIXXm42ngt2Kas0

[@Mainline100]

And summation of inertias is just sum of them right?

[@carultch]

Provided that they all are based on the same axis of rotation, yes. If they are not based on the same axis of rotation, you would need to use the parallel axis theorem to shift the axis away from the center of mass, to the common axis of rotation. Example: a rod (mass Mr, length L) about its center with two identical solid uniform spheres (radius R, mass Ms) centered on its the two ends. Incorrect: 1/12*Mr*L^2 + 2*2/5*Ms*R^2 Correct: 1/12*Mr*L^2 + 2*Ms*(2/5*R^2 + (L/2)^2)

[@sharanya2045]

16 hours left... I am going to pass!

[@alexiscruz5854]

What frc team are you

[@gautamchas2494]

all hail dean kamen

[@DominicProMax]

I love your editing tricks 😏

[@FlippingPhysics]

I don't know what you are talking about. Everything is real! 😜

[@mrwilliamsphysics]

I really enjoyed this video. As I teach physics it is great to see good explanations of topics. Here is a link to my notes on Rotation: kzbin.info/aero/PLfm0FJ-UppoHOfQk8bCECGQMOQ9D0McIL As well as a link to some practice AP Questions: kzbin.info/aero/PLfm0FJ-UppoFwIdEoZeYeSlpCoXDn6Z8y It is always great for students to see concepts from multiple viewpoints.

[@devankagarwal6231]

Damn Helpful. Thank you!

[@justinwu897]

im going to ace it

[@SolisStegosaurus]

what if i got like crazy hitchhikers thumb

[@skibscob]

there is a person named johnathan watching this video rn

[@alexmartinez5519]

Imsa was here 😂

[@honeybunchesofoats3773]

I love you

[@FlippingPhysics]

💋

[@shivshankarkumarsinha3928]

why do professors like you always like to have curly long hairs?

[@FlippingPhysics]

Perhaps you could do a science fair project about it.

[@SuHAibLOL]

12 hours to go

[@FlippingPhysics]

Good luck today!