Lect 5 Moments Couples

8/2/2019 Lect 5 Moments Couples

1/37

- Moment of a vector

- Force couples


2/37


3/37


4/37


5/37


6/37


7/37


8/37


9/37


10/37


11/37


12/37


13/37


14/37


15/37


16/37


17/37


18/37


19/37


20/37


21/37


22/37


23/37


24/37


25/37


26/37


27/37

1.) product of force by moment arm


28/37

2.) replace force by rectangular components


29/37

Using Law of Transmissibility

d1 = 4 + 2Tan40o

d1 = 2 + 4 cot40o


30/37

3.) By cross product

Vector expression for a moment


31/37

COUPLE


32/37

Moment of a couple

Moment produced by 2 equal and oppositeforces is known as a couple.


33/37

Moment of a couple

moment of couple about any point of reference 0.

cross product: M = r x F


34/37

Moment of a couple


35/37

Force-couple systems

resolution of a force into a force and a couple

equal external effect.


36/37

Example

The indicated force-couple system is applied to a small shaft

at the center of a rectangular plate. Replace this system by asingle force and specify the coordinate of the point on the y-

axis through which the line of action of this resultant forcepasses


37/37

Date post:	05-Apr-2018
Category:	Documents
Upload:	abdul-rahman
View:	218 times
Download:	1 times

Lect 5 Moments Couples

Documents