Rotational Dynamics - Basic Introduction

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This physics video tutorial provides a basic introduction into rotational dynamics. It explains how to calculate the acceleration of a hanging mass attached to a rotating pulley. Examples include pulleys with two hanging masses (atwood machine) and inclined planes with pulleys and kinetic friction.
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Опубликовано:

12 апр 2021

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Комментарии : 124

@TheOrganicChemistryTutor 2 года назад

Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html Full-Length Videos & Exams: www.patreon.com/MathScienceTutor/collections Direct Link to The Full Video: bit.ly/3Gly7fW

@thepeeps191 3 года назад

A video a day keeps the bad grades away. A video a day means my big-brain is here to stay.

@glaciveestudios6170 2 года назад

Haha say less

@gunaviththiyan478 Год назад

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@Muxe668 3 года назад

god bless you, am learning a lot

@crunch7017 5 месяцев назад

YOU'RE A LIFESAVER THANK YOU

@dioutoroo Год назад

Hi, Thanks for the lesson! I have question, can I try the approach of F = mxa and all the acting forces are mg - Inertia of the pulley. So, mxg - Mr^2/2 = mxa, then solve for acceleration of the system and finally the angular acceleration? Thank you

@cameroneinstein546 Год назад

love your legendary content

@nwalijideofor7770 2 года назад

Thank you so much my tutor

@C_Castillo 3 года назад

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@bhargavpatel6776 2 года назад

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@mihleliyema5058 5 месяцев назад

This comment right here is salt to my wounds

@MusicLyrics-gf8oy Год назад

Why didn't you include R² when dividing the total masses on the second question method one?

@XurshidDev 7 месяцев назад

same question right here. Maybe he forgot. But in the formula he had R^2, so he had to include, didn't he?

@filip9925 7 месяцев назад

@@XurshidDev if you look at the dimensions of the equation, it doesnt make sense anymore. he proves that is has to be without R^2 if you watch the long route

@redsoldier4712 4 месяца назад

I was confused as well but the second method made it understandable basically he did algebra when converting the net torque into inertia X angular acceleration = T1 - T2

@sarah-xo5bf 2 года назад

Thank you so much💜💜

@picklerick424 3 года назад

U helped me ace my physics 2 test thx

@electricalnoobject5011 3 года назад

Love you sir❣️

@tailorr8967 3 года назад

Man you are a genius

@oladimejioye6313 3 года назад

Please do a video on symmetry operations 🙏🏽🙏🏽

@FarhinAhmed-be4iu Год назад

Thank you!!!

@user-hv6ef9ie1g 2 месяца назад

THANKS!!

@ayandahabile8771 4 месяца назад

We don't include the weight of the disk among the forces acting on it? Along with the tension?

@johnman5391 2 года назад

Why isn't the net torque negative since it is rotating in the clockwise direction?

@momurkaz3507 Год назад

Doesn't matter treat it as absolute as long as its not acting against another opposing forces or torques

@luisv8887 Год назад

he makes it negative at 17:53

@pianodan1608 6 месяцев назад

You can define an arbitrary direction as positive so long as you are consistent with it, similar to how you can set up convenient coordinate axes as you wish

@900k. Год назад

12:23 Sir you forgot the R²

@andylesch6144 5 месяцев назад

I think it was intentional but im not sure why

@Kateworkss 8 месяцев назад

thanks for this video! but I still have something that confuses me, do we not need to put the negative sign for torque even though the pulley is spinning in the clockwise direction?

@filip9925 7 месяцев назад

if it spins in the clockwise direction, it should be negative, counterclockwise is positive

@Emk315 2 года назад

Of course the moments of Inertia for uniform or rigid objects will be given, hallow shapes, Solid sphere etc.

@RehanaBegum-qj3rm 2 месяца назад

Why does it happen to be CM in the second math while we were adding all the masses . Because we know what is mass for linear, is the moment of inertia for angular. Shouldn't it be 1/2MR²?

@caitlynbotti7186 7 месяцев назад

In the video at around 13:45, tension is expressed as T1 and T2.... but we had described tension in earlier dynamics problems as being the same in magnitude everywhere along a rope.... is that still true here? Im assuming yes, and then we are just assuming equal in magnitude and opposite in direction? Thank you for clarifying!

@jasonzechengpan4491 5 месяцев назад

because before we assume that the pulley is ideal which means it's massless and frictionless. In this case, the pulley has mass, so we cannot assume tension is the same throughout the rope

@enderkoregameing8090 10 месяцев назад

Isn't this system one that's more dynamic? if the wheel has a radius of 2m, has an angular acceleration of 2.45 rad/s^2 and the string with tension is affixed to the rightmost point on the circle, then after that point rotates about 3.14 meters around the circumference (after about 2.5 seconds), wouldn't it be at the bottom? How would we be sure that the block would have that speed after 8 seconds if it could be traveling upwards against the force of gravity? Or is the string disconnected from the wheel immediately after pulling it down?

@marcoghilotti9087 3 года назад

The people are asking for a Physics MCAT video please!!!

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@MrEverest768 3 месяца назад

The torque is going cw so it would be negative for the first problem was that a mistake you made?

@JMac___ Год назад

I fucking love u man

@starlettaboco6622 3 месяца назад

at 20:19 why does the m2a becomes positive without transposing it??

@starlettaboco6622 3 месяца назад

ow sorry it he already realized it. Thanks.

@knowledgeonly9696 4 месяца назад

doin an advance reading knowing my prof is a comple pyscho giving quizzes almost like a new topic he didnt even discussed

@paollamwamba8813 Год назад

Hello sir I'm confused where came 9.8 because in a problem it's not there

@luisv8887 Год назад

9.8 m/s^2 is the acceleration of gravity on earth. It is denoted by g. problems like these are always using earth's gravity so if you see g it is 9.8

@KentBangoy Месяц назад

Uhmm in the first problem, where did the 9.8 come from?

@hellointernet334 Год назад

bruh i feel stupid, i cant seem to understand how we are relating the linear to the rotational

@mathwithsud 3 года назад

👍

@ntokozo_love5473 3 года назад

♥️♥️

@halwest05 2 года назад

Dude physics is so weird like how can u just simply add a minus sign like ur doin simple algebra wizardry.

@luisv8887 Год назад

it depends on convention, for the blocks positive is going towards acceleration and positive for the rotating disk is counter clock wise.

@abel_kidus Месяц назад

I have never been more confused in my life

@jess8824 2 года назад

5:30

@gosagirma 29 дней назад

No reason to not touch the like button

@ethanepp849 3 года назад

ayoo anyone here studying for that ucsb phys 2 final too??? lets goooooooo

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I’m early

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Ang aga q naman pahinge ng reward

@melkamubeyene3899 2 года назад

i feel like an idiot when i study phy 😞

@jayheartifilia9855 3 года назад

@Hobbes9 Год назад

at 20:18 , why does he write m2g+m2a=T2 if m2a is supposed to be negative. Shouldn't it be m2g-m2a ?

@Hobbes9 Год назад

never mind he fixed it like 5 seconds later

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First

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