Mechanical Engineering: Ch 13: Virtual Work Applications (4 of 39) Virtual Work w/ Rotation & Torque

Visit ilectureonline.com for more math and science lectures!
In this video I will explain and show an example where virtual work is use to determine the forces where the members of system is rotated.
Next video in this series can be seen at:
• Mechanical Engineering...

[@momocabaj]

This was a little bit misleading (oversimplified). The idea of torque and the angle of rotation as a vector was not followed thoroughly. Both the vector of torque and rotation are pointing perpendicular to the plane. The rotation vector is always pointing from the plane, while the direction of torque depends on the force direction - this is where cosX should come from. Moreover, d(theta) was dropped without noticing (it should be in each term of the lefthand side). Nevertheless, your videos are super great anyway!

[@garrettbeebe3310]

Isn't the d(theta) vector technically perpendicular to the force vector, not 180 degrees to it, since it points out of the page?

[@Tig88PT]

Well, 1 year later but I guess later is better than never...
The angle is in relation to the Torque F.a I assume, and the Torque generated by F and the displacement d(theta) make an angle of 180 degrees, one goes inside the monitor and the other one out of it

[@klam77]

The "Principle of Moments" taught in school is really the Principle of Virtual Work in hiding!

[@MichelvanBiezen]

🙂

[@user-jy6cx4nv9l]

I'm confused your most important videos of Senior secondary classes are in mechanical engineering section 🙄

[@MichelvanBiezen]

Why does that make you confused?