Force and Statics Principles Essay

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Introduction to Statics

Principles Of Engineering

© 2012 Project Lead The Way, Inc.

Statics
The study of forces and their effects on a system in a state of rest or uniform motion

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Statics Principles
Newton’s First Law of Motion (law of inertia):
An object in a state of rest or uniform motion will continue to be so unless acted upon by a net force

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Statics Principles
Newton’s Second Law of Motion:
The acceleration of an object is proportional to the net force acting on the object and inversely proportional to the object’s mass
Force = Mass x Acceleration

F = ma

Statics Principles
Newton’s Third Law of Motion:
For every action force, there is an equal and opposite reaction force

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Equilibrium
Static Equilibrium:
A condition where there is not a net external force acting upon a particle or rigid body and the body remains at rest or continues at a constant velocity

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Equilibrium
Translational Equilibrium:
The state in which there are no unbalanced forces acting on a body

 F =0
 F =0 x y

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Balanced

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Unbalanced

Equilibrium
Rotational Equilibrium:
The state in which the sum of all the clockwise moments equals the sum of all the counterclockwise moments about a pivot point

 M=0
Remember
M=dxF

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Statics Principles
Scalar Quantities:
A physical quantity that has magnitude only

Examples: Mass, length,

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time, volume, temperature, pressure, and speed

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Statics Principles
Vector Quantities:
A physical quantity that has both a magnitude and
direction

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