Mechanics
Mechanics:
Description of forces and energies
associated
with moving objects;
a manifestation of forces acting on material objects
Components of Mechanics:
Mass = measure of a resistance to force; the total number of atoms
in some material.
Velocity = speed and directon of a moving object
Acceleration = a change in the velocity of an object; an object
moving at constant velocity has no acceleration.
Force = causes an acceleration; a change in velocity is a
manifestation of a force being applied to an object. If there are
no forces acting on an object there will be no acceleration.
Description of forces and energies
associated
with moving objects;
a manifestation of forces acting on material objects
Components of Mechanics:
Newton described mechanics fully in terms of three laws:
- constant velocity with no forces,
- F= ma,
- equal and opposite reactions
Newton's Three Laws:
What is Energy?
Energy comes in many forms, kinetic, potential (stored), heat, etc. Energy is always conserved. It is not created or destroyed but is just transformed from one form to another.
Energy = FORCE * DISTANCE
Power = Energy/Time
Energy = Power * Time
A kilowatt is a unit of Power
A kilowatt hour is a unit of Energy
Two Main Kinds of Energy
Fundamental of Mechanics (Read)
Applied mechanics is a branch of the physical sciences and the practical application of mechanics. Applied mechanics examines the response of bodies (solids and fluids) or systems of bodies to external forces. Some examples of mechanical systems include the flow of a liquid under pressure, the fracture of a solid from an applied force, or the vibration of an ear in response to sound. A practitioner of the discipline is known as a mechanician.What is Energy?
Energy comes in many forms, kinetic, potential (stored), heat, etc. Energy is always conserved. It is not created or destroyed but is just transformed from one form to another.
Energy = FORCE * DISTANCE
Power = Energy/Time
Energy = Power * Time
A kilowatt is a unit of Power
A kilowatt hour is a unit of Energy
Two Main Kinds of Energy
- Kinetic Energy
- Potential Energy
Fundamental of Mechanics (Read)
Applied mechanics, as its name suggests, bridges the gap between physical theory and its application to technology. As such, applied mechanics is used in many fields of engineering, especially mechanical engineering. In this context, it is commonly referred to as engineering mechanics.
Some of the departments that put the subject into practice are Civil Engineering, Mechanical Engineering, Construction Engineering, Materials Science and Engineering, Aerospace Engineering, Chemical Engineering, Electrical Engineering, Nuclear Engineering, Structural engineering and Bioengineering.
Typically, engineering mechanics is used to analyze and predict the acceleration and deformation (both elastic and plastic) of objects under known forces (also called loads) or stresses.
When treated as an area of study within a larger engineering curriculum, engineering mechanics can be subdivided into
- Statics, the study of non-moving bodies under known loads
- Dynamics (or kinetics), the study of how forces affect moving bodies
- Mechanics of materials or strength of materials, the study of how different materials deform under various types of stress
- Deformation mechanics, the study of deformations typically in the elastic range
- Fluid mechanics, the study of how fluids react to forces. Note that fluid mechanics can be further split into fluid statics and fluid dynamics, and is itself a subdiscipline of continuum mechanics. The application of fluid mechanics in engineering is called hydraulics.
- Continuum mechanics is a method of applying mechanics that assumes that all objects are continuous. It is contrasted by discrete mechanics.
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