Rigid Bodies Equations of Motion Rotation (Learn to solve any question)

Learn about dynamic rigid bodies and equations of motion concerning rotation about a fixed axis with animated examples. Learn to figure out the moment about a point, writing normal and tangential acceleration equations, and using kinetic diagrams to figure out unknowns.

Intro (00:00)
Kinetic Diagram (01:39)
Equations of Mass Moment of Inertia (02:30)
The uniform 24-kg plate is released from rest at the position shown (02:44)
The two blocks A and B have a mass of 5 kg and 10 kg (06:47)
The 30-kg disk is originally spinning at ω = 125 rad/s (08:27)

Book used: R. C. Hibbeler and K. B. Yap, Mechanics for engineers - dynamics. Singapore: Pearson Education, 2014.

[watermelonboy]

Best videos on dynamics EVER!
This is how i studied for dynamics
1. Read the chapter and take notes
2. Try some fundamental problems
3. Watch your video and try all problems before seeing solution
4. Do ALL fundamental problems from textbook WITH EASE
5. Get A's on every
Any desire to do hydromechanics?

[jadkhalil]

The second I'm beginning to stress over a concept I immediately watch your videos thank you for making dynamics easier !!!

[hamanprnzhd]

It would be awesome if you make videos about the basics thermodynamics material, your explanation is much better than our professors...animations help a lot in learning...I am personally learning a lot from your channel, God bless you man

[estefaniagomez]

Súper life saving, you deserve way more views, pls keep going <3

[SkelaKing]

I've been watching literally all of your Dynamics videos over the last few weeks in preparation for finals and you're literally saving my life. I'll edit this comment in 2 weeks to see if all this studying worked

[jerickmarzan]

Your videos really helped me in answering my problem sets in dynamics! keep uploading more videos! you're the best!

[robbieenglish]

Another awesome video!! Will be taking thermo next semester, and I was very glad to see you have videos for it as well :)

[Dc-jmjk]

This might be a simple question but for the last exercise, I first attempted to solve it by myself with the n-t coordinate system, but then realized the x-y system should be used. I was just confused because the procedure for analysis for the book also tells us to establish the n-t coordinate system in this chapter. Are there any simple ways to identify which coordinate system should be used?

[robertjohnoamil]

for problems on finding the angular acceleration, how can you determine the appropriate approach in solving for either translational or centroidal (like in this video)?

[mertt]

incredibly helpful. thanks for saving lives

[sayanjitb]

Dear sir, at 9:19 how could you assume that force on pin A was acting along the line joining A and B?

[Maybe.]

That's impressive !
I really do appreciate your work .
Thank You

[HashemAljifri]

Hello sir, should I use kinetic diagram for every problem?

[TheSpokenBanana]

Hey, thanks for the clear explanations! I'm not sure how quick I'll get a reply here, but for the problem at 6:47, are the accelerations at both block A and B still the same if the pulley at O is made of two different plates, both with different masses and radiuses? For example, in the problem I have, the pulley is set up the way as I described and block A is tied to the plate with the bigger radius and mass, and block B is tied to the one with the smaller radius and size.

[kanhchanaly]

Hi sir, at 9:20, is the force AB drawn acting on the member or the disk?

[morenamogoje]

Thank you so much for this videos, you really saved my semester

[rhamby]

I've said this before but thanks for these videos. They are so helpful and extremely well made

[sasukekianhoong]

Hi sir, why didn't Ax component and Ay component be drawn in the free body diagram at point A in the third question at 9.20 ? It is because Fab is the resultant force of component Ax and Ay aldy? Same for point B also?

[karimelfar]

for 3:36 how did you find the 45 degree angle was that just tan inverse.

[khalednazeer]

For question number 2, because we are using the point at the center of the pulley, wouldnt the moment only equal I*(angular acceleration), or is incorporating ma a different method