# ch4_1lecture - MOMENT OF A FORCE (Section 4.1) Todays...

This preview shows pages 1–7. Sign up to view the full content.

MOMENT OF A FORCE (Section 4.1) Today’s Objectives : Students will be able to: a) understand and define moment, and, b) determine moments of a force in 2-D and 3-D cases. Moment of a force

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

View Full Document
APPLICATIONS What is the net effect of the two forces on the wheel?
APPLICATIONS (continued) What is the effect of the 30 N force on the lug nut?

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

View Full Document
MOMENT IN 2-D The moment of a force about a point provides a measure of the tendency for rotation (sometimes called a torque).
MOMENT IN 2-D (continued) In the 2-D case, the magnitude of the moment is M o = F d As shown, d is the perpendicular distance from point O to the line of action of the force. In 2-D, the direction of M O is either clockwise or counter-clockwise depending on the tendency for rotation.

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

View Full Document
MOMENT IN 2-D (continued) For example, M O = F d and the direction is counter-clockwise. Often it is easier to determine M O by using the components of F as shown. Using this approach, M O = (F Y a) – (F X b). Note the different signs on the terms! The typical sign convention for a moment in 2-D is that counter-clockwise is considered positive.
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/20/2011 for the course ENG 1333 taught by Professor Brr during the Spring '10 term at American College of Computer & Information Sciences.

### Page1 / 14

ch4_1lecture - MOMENT OF A FORCE (Section 4.1) Todays...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online