Basic Concept In Static

1. .

2.  The physical science which describes and
predicts the condition of rest or motion bodies
under the action of force.
 Divided into 3 parts:
1. Mechanics of rigid bodies
2. Mechanics of deformable bodies
3. Mechanics of fluids

3. • Space - associated with the notion of the position of a
point. The position of the point may be defined by three
lengths measured from a certain reference point, or origin
in three given direction.
• Time – conceived as a succession of events.
• Mass –the amount of matter in an object to which its weight
is proportional.
• Force - any influence that causes a free body to undergo a
change in speed, a change in direction, or a change in
shape
• Particles – a very small amount of matter which may be
assumed to occupy a single point in space
• Rigid body – combination of a large number of particles
occupying fixed positions with respect to each other.

4. Quantity Metric Unit (SI units)
1.Length Meter (m)
2.Mass Kilogram (Kg)
3.Time Second (s)
4.Force Newton (N)

5.  Scalar – A quantity has only magnitude without
direction. ( Mass, time, area, etc)
 Vector- quantity that has magnitude and
direction. ( force, velocity, acceleration, etc..)

6.  Fixed vector – a vector for which a unique point of
application is specified and thus cannot be moved
without modifying the condition of the problem.
 Free vector – a vector whose action is not
confined to or associated with a unique line in
space
 Sliding vector – a vector for which a unique line in
space (line of action) must be maintained

7. • First law: Every body remains in a state of rest or
uniform motion (constant velocity) unless it is acted
upon by an external unbalanced force
• Second law: A body of mass m subject to a force F
undergoes an acceleration a that has the same
direction as the force and a magnitude that is directly
proportional to the force and inversely proportional to
the mass, i.e., F = ma.
• Third law: The mutual forces of action and reaction
between two bodies are equal, opposite and collinear.
This means that whenever a first body exerts a force F
on a second body, the second body exerts a force −F
on the first body.

8.  Base unit are units of length, mass and time.
 SI Units
length – meter (m)
Mass – kilogram (kg)
Time – second (s)
 Derived unit
Force - Newton (N)
1 N = 1kg. 1m/s2

9. Multiple Exponential
Form
Prefix SI Symbol
1 000 000 000 109
giga G
1 000 000 106
mega M
1 000 103
kilo k
0.001 10-3
milli M
0.000 001 10-6
micro μ
0.000 000 001 10-9
nano n

10. Multiple Exponential
Form
Prefix SI Symbol
1 000 000 000 109
giga G
1 000 000 106
mega M
1 000 103
kilo k
0.001 10-3
milli M
0.000 001 10-6
micro μ
0.000 000 001 10-9
nano n