ch4_5_student_notesF2010

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

Info icon 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
Image of page 1

Info icon 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?
Image of page 2
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.
Image of page 3

Info icon 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.
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern