Mechanics
Mechanics is the science that studies the motion of bodies under the influence of forces, including the
unique situation where a body remains at rest. The forces that bodies exert on one another are of
primary relevance in the issue of motion.
Explain:
According to the nature of the forces involved, this leads to the study of topics such as gravity,
electricity, and magnetism. Given the forces, one may investigate how bodies move under the influence
of forces; this is the domain of mechanics proper.
Mechanics may be divided into three branches: statics, which deals with forces acting on and in a body
at rest; kinematics, which describes the possible motions of a body or system of bodies; and kinetics,
which attempts to explain or predict the motion that will occur in a given situation.
Statics: the branch of mechanics concerned with bodies at rest and forces in equilibrium.
Kinematics: the branch of mechanics concerned with the motion of objects without reference to the
forces which cause the motion.
Dynamics: the branch of mechanics concerned with the motion of bodies under the action of forces.
Mechanics: the branch of applied mathematics dealing with motion and forces producing motion.
Statics, Kinematics and Dynamics are all branches of Mechanics, while mechanics is a branch of
mathematics and encompasses all of them.
In Statics, there is no motion- just forces. In Kinematics, there is motion but no mention of forces. In
Dynamics, there is motion and forces. In dynamics you have forces, motion and no motion. This is
correct for solids, liquids and gases with the word fluid encompassing the last two phases- fluids and
gases.
Fluid Mechanics
The study of the effects of forces and energy on liquids and gases is known as fluid mechanics. The topic,
like other parts of classical mechanics, is divided into statics (also known as hydrostatics) and dynamics
(fluid dynamics, hydrodynamics, or aerodynamics). Hydrostatics is a very simple subject with a few
important classical results but little room for advancement. In contrast, fluid dynamics is a highly
established discipline of physics that has been the focus of ongoing and developing research since
around 1840.
Fluid Mechanics is the discipline of science that examines the behavior of fluids in motion and at rest.
Whether the fluid is at rest or in motion, it is subjected to various forces and environmental
circumstances, and it responds in these situations in accordance with its physical qualities. Fluid
mechanics is comprised of three elements of fluids: statics, kinematics, and dynamics.
Explain:
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Fluid statics: (also known as hydrostatics)
The fluid which is in state of rest is called as static fluid and its study is called as fluid
statics.
Fluid kinematics:
The fluid which is in state of motion is called as moving fluid. The study of moving fluid
without considering the effect of external pressures is called as fluid kinematics.
Fluid dynamics:
The branch of science which studies the effect of all pressures including the external
pressures on the moving fluid is called as fluid dynamics.
Why Study Fluid Mechanics
What is the necessity of studying fluids as an aspect of engineering? Fluids are already an integral part of
our day-to-day life. Engineering allows us to explore the potential of fluids for a number of new
applications and various functions. Some of these include:
1) There are number of fluids that when burnt, produce lots of heat, which can be used for various
applications. Examples of these fluids includes petrol and diesel for vehicles.
2) There are some fluids like oil that have a tendency to exert very high pressure or force. These fluids
can be used for lifting various heavy loads. The fluids used in hydraulic machines and hydraulic lifters
are an example.
3) Some fluids have excellent flow properties which can be used for the lubrication of various
machines.