Static in SI Unit

Mechanics

- Can be devided into 3 branches:

1. Rigrid-bidy Mechanics
2. Deformable-body Mechanics
3. Fluid Mechanics
   

- Rigrid-body Mechanics deals with

1. Statics
   - Equilibrium of bodies
   - At rest
   - Move with constant velocity
2. Dynamics
   - Accelerated motion of bodies
   

Fundamentals Concepts

- Basic Quantities

• Length – locate the position of a point in space
• Mass – measure of a quantity of matter
• Time – succession of events
• Force – a “push” or “pull” exerted by one body on another
  

- Idealizations

• Particles – has a mass and size can be neglected
• Rigrid Body – a combination of a large number of particles
• Concentrated Force – the effect of a loading
  

- Newton’s Three Laws of Motion

• First Law
  “A particle originally at rest, or moving in a straight line with constant velocity, will remain in this state provided that the particle is not subjected to an unbalanced force”
• Second Law
  “A particle acted upon by an unbalanced force F experiences an acceleration a that has the same direction as the force and a magnitude that is directly proportional to the force”

• Third Law
  “The mutual forces of action and reaction between two particles are equal and, opposite and collinear”

F = force of gravitation between two particles
G = universal constant of gravitation
m1, m2 = mass of each of the two particles
r = distance between the two particles

Weight :
Letting :
Yields :