1. Week 1 Fundamentals of Engineering Mechanics:
Objectivities of this class
1. Fundamentals of Engineering Mechanics
- Definitions of Key Concepts
2. Statics
- Fundamental Statics of a Rigid Body
3. Summary
- Summary, Quiz, Real-life examples
This class is lecturing in order of above objectivities.

2. 1. Introduction
- What is Engineering Mechanics? –
Engineering Mechanics
Kinematics Kinetics
DynamicsStatics
Week 1 Fundamentals of Engineering Mechanics:

3. 1. Introduction
- What is Engineering Mechanics? –
Engineering Mechanics
Kinematics Kinetics
DynamicsStatics
Week 1 Fundamentals of Engineering Mechanics:
Branch of science which deals with the
behavior of a body when the body is at
rest or in motion.
Divided in two branch with Statics and
Dynamics.

4. 1. Introduction
- What is Engineering Mechanics? –
Engineering Mechanics
Kinematics Kinetics
DynamicsStatics
Week 1 Fundamentals of Engineering Mechanics:
Body is at rest. Body is in
motion.

5. 1. Introduction
- What is Engineering Mechanics? –
Engineering Mechanics
Kinematics Kinetics
DynamicsStatics
Week 1 Fundamentals of Engineering Mechanics:
When the forces are
also considered for
the body in motion
When the forces which
cause the motion are
not considered.

6. 2. Definitions(Key concepts)
◆ Vector Quantity:
A quantity which is completely specified by magnitude and
direction ex: velocity ,acceleration
◆ Scalar Quantity:
A quantity, which is completely specified by magnitude only ex:
mass ,length, temperature….
◆ A Particle :
A particle is a body of infinitely small volume and the mass of
the particle is considered to be concentrated at a point
Week 1 Fundamentals of Engineering Mechanics:

7. 2. Definitions(Key concepts)
◆ Law of Parallelogram of Forces :
Used to determine the resultant of two forces acting at a point
in a plane
- If two forces, acting at a point be represented in magnitude
and direction by the two adjacent sides of a parallelogram,
then their resultant is represented in magnitude and
direction by the diagonal of the parallelogram passing
through that point.
Week 1 Fundamentals of Engineering Mechanics:

8. 2. Definitions(Key concepts)
◆ Law of Parallelogram of Forces :
* From C draw CD perpendicular to OA produced.
Let Now
a = Angle between two forces P and Q
= LAOB
Angle LDAC=LAOB = a
Week 1 Fundamentals of Engineering Mechanics:

9. 2. Definitions(Key concepts)
◆ Law of Triangle of Forces:
If three forces acting at a point be represented in magnitude
and direction by the three sides of a triangle, taken in order,
they will be in equilibrium.
◆ Lami's Theorem :
If three forces acting at a point are in equilibrium, each force will
be proportional to the sine of the angle between the other two
forces.
Week 1 Fundamentals of Engineering Mechanics:

10. 2. Definitions(Key concepts)
Week 1 Fundamentals of Engineering Mechanics:

11. 2. Definitions(Key concepts)
◆ System of Units:
* C.G.S. System of units.
Length is expressed in centimetre, mass in gram and
time in second.
The unit of force in this system is dyne
* M.K.S. System of Units.
Length is expressed in metre, mass in kilogram and
time in second.
* S.I. System of Units:
Length is expressed in metre, mass in kilogram and
time in second.
The unit of force in this system is Newton
and is represented N.
Week 1 Fundamentals of Engineering Mechanics:

12. 2. Definitions(Key concepts)
◆ System of Units:
<Relation between Newton and Dyne>
Week 1 Fundamentals of Engineering Mechanics: