PPT: Equilibrium of a Rigid Body | Engineering Mechanics - Civil Engineering (CE) PDF Download

 Page 1


Objectives
1. To introduce the concept of the free-
body diagram for a particle.
2. To show how to solve particle 
equilibrium problems using the 
equations of equilibrium.
Page 2


Objectives
1. To introduce the concept of the free-
body diagram for a particle.
2. To show how to solve particle 
equilibrium problems using the 
equations of equilibrium.
Page 3


Objectives
1. To introduce the concept of the free-
body diagram for a particle.
2. To show how to solve particle 
equilibrium problems using the 
equations of equilibrium.
Definitions
1. A particle is in equilibrium if it is at rest if 
originally at rest or has a constant velocity if 
originally in motion. 
2. Static equilibrium denotes a body at rest.
3. Newton’s first law is that a body at rest is 
not subjected to any unbalanced forces.
Page 4


Objectives
1. To introduce the concept of the free-
body diagram for a particle.
2. To show how to solve particle 
equilibrium problems using the 
equations of equilibrium.
Definitions
1. A particle is in equilibrium if it is at rest if 
originally at rest or has a constant velocity if 
originally in motion. 
2. Static equilibrium denotes a body at rest.
3. Newton’s first law is that a body at rest is 
not subjected to any unbalanced forces.
F0 ?
?
r
Static Equilibrium
Page 5


Objectives
1. To introduce the concept of the free-
body diagram for a particle.
2. To show how to solve particle 
equilibrium problems using the 
equations of equilibrium.
Definitions
1. A particle is in equilibrium if it is at rest if 
originally at rest or has a constant velocity if 
originally in motion. 
2. Static equilibrium denotes a body at rest.
3. Newton’s first law is that a body at rest is 
not subjected to any unbalanced forces.
F0 ?
?
r
Static Equilibrium
F is the vector sum of all
forces acting on the particle.
?
r
Static Equilibrium