AEM 2021 Lecture 25: Equilibrium of Rigid Bodies- Preliminaries 1-25-17

7 Pages
Unlock Document

Aerospace Engineering and Mech
AEM 2021
Hesla Todd

Equilibrium of Rigid Bodies- Preliminaries 1-25-17 Movement of a force Recall- forparticle, condition of equilibriumR=sum of Forces=0. Expresses that Systems of forces have zero net tendency to "translate" particles Rigid Body Can rotate (as well as translate) For equilibrium- must prevent both translation and rotation So, must study tendency of system of forces to cause rotation, leads to momentof a force 2D Scenario Where d=offset distance (of LOA from O) Goal- find tendency of F to cause body to rotate about O. Experience teaches tendency to cause rotation proportional to both ● Magnitude of F ● Offset distance d (LOA from O) So,Tendency to cause rotation of F about d. Define moment of F about O Refine by distinguishing CW from CCW rotation to find direction, use inspection of the diagram Imagine a string pulling on A. This will cause CCW rotation. Units SI units are Newton meters Nm. Peasant units are foot pounds lb ft (or lb in) Conclusion: Principle of Transmissibility From definition of moment, clear that slidigalong LOA won't change moment → won't change tendency to rotate Si
More Less

Related notes for AEM 2021

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.