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ENGINEERING DYNAMICS

Dynamics is "a study of motion," according to Pletta and Frederick , divided into kinematics (a study of motion solely) and kinetics (a study of both motion and the forces that produce it).

Dynamics in engineering is universally studied in concert with--usually immediately following--the consideration of statics--the study of forces exerted by and upon bodies at rest. Together, statics and dynamics form engineering (or 'applied') mechanics.

Pletta and Frederick introduce dynamics with the seemingly outrageous assertion: "Dynamics is important in all fields of engineering because everything an engineer designs moves in some way during its lifetime."

Problems are solved in dynamics with theoretical constructs that differ depending on the types of forces being applied. Those force systems include: constant forces, forces that change with (straight-line or angular) distance, forces that vary with both distance and velocity, ballistics (dealing with the motion of particles reacting solely to gravity), and central force motions (attractions of two bodies for one another).

The fundamental consideration in dynamics is the combination of the magnitudes and directions of all forces acting on a body in motion. The representation of physical characteristics having both size and direction is a vector. (Quantities with magnitude only, for which direction of their action is either irrelevant or nonexistent, are scalar quantities.) Speed, mass, cost, and the number-count of things (fourteen elephants, two baseballs, etc.) are scalar quantities. Velocities, acceleration, and forces are vectors.

At the outset, balance must be struck between: 1)belaboring the obvious importance of vector quantities and their summation and multiplication and 2) missing the critical essence of motion itself which distinguishes bodies with unbalanced forces from those at equilibrium.

Motion is a change in placement over time. It is characterized...

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ENGINEERING DYNAMICS. (1969, December 31). In LotsofEssays.com. Retrieved 08:47, March 28, 2024, from https://www.lotsofessays.com/viewpaper/1682436.html