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Mechanics is the science which studying the effects of forces on the rigid element and the motion of elements.

The mechanic divided into two parts statics and dynamics, statics studies the equilibrium of rigid element under action of forces, and dynamics studies the motion of rigid element.

**Basic concepts**

Space, Time, Mass and force are the basic concepts in mechanics, they are absolutely quantities except force and can't be defined, so they be known from our life and used as a mental frame for studying mechanic.

**Space**: the space is the geometric field used to determined the position by some references geometric systems so it includes point, line, plane and volume the unit for measurement is Meter (m), centimeter (cm) or millimeter (mm) so there are other units for measurements in the other side the area is measured by (m^{2}, cm^{2} and mm^{2}) and the volume measured by (m^{3}, cm^{3} and mm^{3}).

Point: is an element in the space which hasn't any volume no length no depth no width.

Line: contain limit points begin from a point and ends at other point without width or depth one-dimensional.

Plane: is a surface without width and has two-dimensional.

Volume: has three-dimensional.

**Time: **the time is the period measured by Second (sec), minute (min) or hour (hr) so there are other units used to measure the time.

**Mas**s: the mass resist the motion or velocity so it is measured by kilogram (kg) or others gram and ton.

**Force**: the force is an action happen between bodies one body on anther body, the forces between two bodies are opposite in direction and equal in magnitude. The force tends to move the body on the direction of its action.

**Laws of Mechanics**: they include the parallelogram law, the principle of transmissibility, Newton's first law, Newton's second law, Newton's third law and Newton's law of gravitation.

Newton laws:

First law: *Everybody continues in its stat of rest, or of uniform motion in right line, unless it is compelled to change that state by forces impressed upon it.*

Second law: *The change of motion is proportional to the motive force impressed, and is made in the direction of the right line in which that force is impressed.*

Third law: *To every action there is always opposed an equal reaction: or, the mutual action of two bodies upon each other are always equal, and directed to contrary parts.*

Newton's law of gravitation: *Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of the masses of the particles and inversely proportional to the square of the distance between them.*

**Importance of Mechanics **

As the mechanics introduced the since which studying the effects of forces on the rigid element and the motion of elements which depended generally on the Newton laws 17^{th} century, so the mechanic has two branch static mechanic and dynamic mechanic so why the mechanics is important in academic curriculum?

The mechanic has many important applications in the areas of since such as engineering the equilibrium and stability of structures designing mechanical engineering and others, Astronomy celestial mechanics, Geology the propagation of seismic waves, generated by earthquakes, through the earth's crust and Chemistry the dynamics of molecular collisions...

Mechanics provides the (building blocks) of statics, strength of materials, and fluid dynamics.

Statics conceder the effects and distribution of the forces on the construction so there are topics analysis, cables, equilibrium of force system, friction, resultant of force system, moments of inertia and center mass.

Strength of Materials is the method to find out the internal effect of external forces applied to construction element. Stress, strain, deformation deflection, torsion, flexure, shear diagram, and moment diagram are some of the topics covered by this subject. The information is used for mechanical engineering, electrical engineering, Civil engineering, and others.

Fluid dynamics is a since studying the flow around the bodies, the bodies can be surrounded by gas or liquids.

Researches use both experiments and mathematical models and calculations to understand fluid dynamics.

The data collected from wind tunnel studies and other experiments are often very complex. Scientists today use models of fluid behavior and powerful computers to analyze and interpret those data.

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