ch4_5_student_notesF2010

# ch4_5_student_notesF2010 - MOMENT ABOUT AN AXIS(Section 4.5...

• Notes
• 8

This preview shows pages 1–5. Sign up to view the full content.

MOMENT ABOUT AN AXIS (Section 4.5) Today’s Objectives : Moment of a force about an axis using a) scalar analysis, and b) vector analysis. In-Class Activities : Applications Scalar analysis Vector analysis Examples Questions

This preview has intentionally blurred sections. Sign up to view the full version.

APPLICATIONS With the force F , a person is creating the moment M A . What portion of M A is used in turning the socket? The force F is creating the moment M O . How much of M O acts to unscrew the pipe?
SCALAR ANALYSIS Recall that the moment of a force about any point A is M A = F d A where d A is the perpendicular (or shortest) distance from the point to the force’s line of action . This concept can be extended to find the moment of a force about an axis. In the figure above, the moment about the y-axis would be M y = 20 (0 . 3) = 6 N·m. However this calculation is not always trivial and vector analysis may be preferable.

This preview has intentionally blurred sections. Sign up to view the full version.

VECTOR ANALYSIS Our goal is to find the moment of F (the tendency to rotate the body) about the axis a’-a.
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern