Define an angle between the force and any coordinate axis, provided the angle is <=90. Use the cosine
and sine to find the force components on the nearest axis. If any of these component lies in a negative
coordinate add a - sign. Please consider the belo
MENG 2230
STATICS
Dr. Fadi Alsaleem
Lecture 2
The slides are adapted from the text book, Vector mechanics for engineers
Check this .
http:/www.physicsclassroom.com/Physics-Interactives/Vectors-andProjectiles/Vector-Addition/Vector-Addition-Interactive
2-2
MENG 2230
STATICS
Dr. Fadi Alsaleem
The slides are adapted from the text book, Vector mechanics for engineers
What is Mechanics?
Mechanics is the study of bodies under the action of forces.
Categories of Mechanics:
- Rigid bodies
- Statics bodies at res
MENG 2230
STATICS
Dr. Fadi Alsaleem
Lecture 2
The slides are adapted from the text book, Vector mechanics for engineers
Expressing a Vector in 3-D Space
If the direction cosines are given:
With the angles between F and the axes,
Fx F cos x Fy F cos y Fz
Angles needs to be measured from a positive axis going toward the other
positive axis until we reach the vector.
Examples:
Z+
Wrong as here we are
moving toward the z-
X+
X-
ZZ-
Wrong as here we are
moving toward the z-
X+
No back to the problem we tried