FORCE
ANALYSIS
INTRODUCTION
The subject Dynamics of
Machines may be defined as that branch of Engineering-science, which deals with
the study of relative motion between the various parts of a machine, and forces
which act on them. The knowledge of this subject is very essential for an
engineer in designing the various parts of a machine.
A machine is a device
which receives energy in some available form and utilises it to do some
particular type of work.
If the acceleration of moving links in a
mechanism is running with considerable amount of linear and/or angular
accelerations, inertia forces are generated and these inertia forces also must
be overcome by the driving motor as an addition to the forces exerted by the
external load or work the mechanism does.
NEWT
ON’S LAW : First Law
Everybody will persist in its state of
rest or of uniform motion (constant velocity) in a straight line unless it is
compelled to change that state by forces impressed on it. This means that in
the absence of a non-zero net force, the center of mass of a body either is at
rest or moves at a constant velocity.
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.
Alternatively, the total force applied on a body is equal to the time
derivative of linear momentum of the body.
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. F and −F are equal in magnitude and opposite
in direction. This law is sometimes referred to as the action-reaction law,
with F called the "action" and −F the
"reaction"
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