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Examen
LATEST 2024 Engineering Mechanics Lecture 3
Chapter Outline 
Copyright © 2010 Pearson Education South Asia Pte Ltd 
1. Condition for the Equilibrium of a Particle 
2. The Free-Body Diagram 
3. Coplanar Systems 
4. Three-Dimensional Force Systems 
3.1 Condition for the Equilibrium of a Particle 
Copyright © 2010 Pearson Education South Asia Pte Ltd 
• Particle at 
equilibrium if 
- At rest 
- Moving at constant a constant velocity 
• Newton’s first law of motion 
∑F = 0 
where ∑F is the vector sum of all the forces acting on 
t...
Examen
Engineering Mechanics: Statics with 100% verified answers.
Statics - a science which deals with the action of forces on bodies, the forces being so arranged that 
they are in equilibrium. 
Force - a pull or push, which acting on a body changes or tends to change, the state of rest or 
uniform motion of the body. Measured in Newton (N). 
Force System - a number of forces acting on a body
Examen
Engineering Mechanics equilibrium_of_a_particle
Engineering Mechanics equilibrium_of_a_particle 
3.1	Condition for the Equilibrium of a Particle 
 
•	Newton’s second law of motion 
∑F = ma 
 
•	When the force fulfill Newton's first law of motion, 
ma = 0 
a = 0 
therefore, the particle is moving in constant velocity or 
at rest 
 
3.2	The Free-Body Diagram 
 
•	Best representation of all the unknown forces (∑F) which acts on a body 
•	A sketch showing the particle “free” from the surroundings with all the forces acting on ...