3. Objectives of the lesson
• Concept and Definition of Mechanics,
• Types of Mechanics
• Definition, basic quantities and derived quantities of basic units and
derived units.
• Measurement
• Different systems of units (FPS, CGS, MKS and SI) and their conversion
from one system to another system.
• Concept of rigid body, scalar and vector quantities
4. Outlines/objectives
• Definition of forces
• types of forces, effects and characteristics of a force.
• Different force systems (coplanar and non-coplanar),
• forces, resultant force
• Definition and concept of friction, types of friction,
• force of friction.
• Laws of static friction, coefficient of friction,
5. Mechanics?
•The branch of applied physics dealing with
motion and forces producing motion.
OR
•Mechanics is the science which describes
and predicts the conditions of rest or motion
of bodies under the action of forces
6. Cont…
•Mechanics is an area of science concerned
with the behavior of physical bodies when
subjected to forces or displacements, and
the subsequent effects of the bodies on their
environment
7.
8. STATICS
•It is that branch of Engineering Mechanics,
which deals with the forces and their effects,
while acting upon the bodies at rest
9. • It is that branch of Engineering Mechanics, which deals with the
forces and their effects, while acting upon the bodies in motion.
• The subject of Dynamics may be further sub-divided into the
following two branches :
1. Kinetics, and
2. Kinematics.
10. KINETICS
•It is the branch of Dynamics, which
deals with the bodies in motion due
to the application of forces.
11. KINEMATICS
•It is that branch of Dynamics, which
deals with the bodies in motion,
without any reference to the forces
which are responsible for the motion.
12. Basic Terms
• Essential basic terms to be understood
• Rigid body: the relative movement between its parts are
negligible
• Dynamics: dealing with a rigid-body in motion
• Length: applied to the linear dimension of a strait line or
curved line
• Area: the two dimensional size of shape or surface
• Volume: the three dimensional size of the space occupied by
substance
13. BASIC TERMS CONT…
• Force: the action of one body on another whether it’s a push
or a pull
• force
• Mass: the amount of matter in a body
• Weight: the force with which a body is attracted toward the
centre of
• the Earth
• Particle: a body of negligible dimension
14. INTRODUCTIONS TO PHYSICAL QUNATITIES
• A physical quantity is a physical property of a material or system
that can be quantified by measurement. A physical quantity can be
expressed as a value, which is the algebraic multiplication of a '
Numerical value ' and a ' Unit ‘.
• For example, the physical quantity of mass can be quantified as
'32.3 kg ', where '32.3' is the numerical value and 'kg' is the Unit.
• A physical quantity possesses at least two characteristics in
common.
1.Numerical magnitude.
2.Units
18. DERIVED UNITS
• Definition derived unit:
By definition, derived units are all those units of Metric System
which are derived or obtained by multiplying and/or dividing
multiple fundamental units and sometimes with other constants.
