Dynamics - Rigid body rotation example 1

Thermodynamics: drive.google.com/file/d/1bFzQ...
Mechanics of Materials: drive.google.com/file/d/1P-pc...
Statics: drive.google.com/file/d/1aYY5...
Dynamics: drive.google.com/file/d/1_JTk...

[@BODYBUILDERS_AGAINST_FEMINISM]

Man every time I get stuck in this class I dont even stress anymore because I know your videos exist and they make everything super simple and easy to follow. seriously thank you so so much for sharing these videos with us also STOP COUGHING RIGHT NOW

[@goldmedal67]

When summing about point O, you forgot about the ma.t direction. I draw a kinetic FBD along with an inertial FBD and ma.t goes downward so it does not go through point O like ma.n does.

[@iam_xrw]

My man's throat was clogged in this one

[@engineeringdeciphered]

🤦🏻‍♂️ covid 🤷🏻‍♂️

[@respectallrushersur4363]

How to determine whether there is rotation occurring in the object ? Like Moment could be =0 if there was no rotation. So basically I'm asking how to determine if a body rotates or not ?

[@engineeringdeciphered]

Yes, if there is no rotation, the sum of the moments will be zero (almost all the time). I think for most problems in my class, it’ll be clear if there is rotation. This one I believe starts in one position and ends in another position, so you’d know it is rotating.

[@BODYBUILDERS_AGAINST_FEMINISM]

Ive a question, if youre not too busy.. at ~9:55 you say that summing the forces about the fixed point (point O) would negate needing to use the third equation 'I*(alpha)+ ma(d)', but then when you took the moment about point G (around the 12:24 mark), you ended up using I*(alpha), not I(alpha) + ma(d). But point G is not a fixed point so why wouldnt you use that equation? thank you for your consideration

[@engineeringdeciphered]

If you sum the moment about the center of gravity you don’t need the mad term.

[@arishbutt1030]

why dot we take moment anti clockwise positve