EPF Lecture Notes for Sections 4_1 - 4_4

# EPF Lecture Notes for Sections 4_1 - 4_4 - MOMENT OF A...

This preview shows pages 1–6. Sign up to view the full content.

MOMENT OF A FORCE (SCALAR FORMULATION), CROSS PRODUCT, MOMENT OF A FORCE (VECTOR 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.

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

View Full Document
APPLICATIONS Carpenters often use a hammer in this way to pull a stubborn nail. Through what sort of action does the force F H at the handle pull the nail? How can you mathematically model the effect of force F H at point O?
MOMENT OF A FORCE - SCALAR FORMULATION (Section 4.1) The moment of a force about a point provides a measure of the tendency for rotation (sometimes called a torque).

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

View Full Document
MOMENT OF A FORCE - SCALAR FORMULATION (continued) 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. In the 2-D case, the magnitude of the moment is M o = F d
(continued) Often it is easier to determine M O by using the components of F as shown. Then 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 . We can determine the direction of rotation by imagining the body pinned at O and deciding which way the body would rotate because of the force. For example, M

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 23

EPF Lecture Notes for Sections 4_1 - 4_4 - MOMENT OF A...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online