Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The...

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Introduction to Statics

Transcript of Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The...

Page 1: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Introduction to Statics

Page 2: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Statics

The study of forces and their effects

on a system in a state of rest or

uniform motion

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Page 3: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

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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Page 4: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

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

Page 5: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Statics Principles

Newton’s Third Law of Motion:

For every action force, there is an

equal and opposite reaction force

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Page 6: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

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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Page 7: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Equilibrium

Translational Equilibrium:

The state in which there are no

unbalanced forces acting on a body

x

y

F =0

F =0

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Balanced Unbalanced

Page 8: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

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=0Remember

M = d x F

Page 9: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Statics Principles

Scalar Quantities: A physical quantity that has

magnitude only

Examples: Mass, length,

time, volume, temperature,

pressure, and speed

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Page 10: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Statics Principles

Vector Quantities: A physical quantity that has

both a magnitude and

direction

Examples: Position,

velocity, force, and moment

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Page 11: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

What Is a Force?

A vector quantity defined by its known

magnitude, direction

In addition, the point of application of a vector

is important.

A 21.8°NE

The pushing or pulling interaction of

objects

Page 12: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Force Units

British System of Units

pound-force (lbf)

International System of Units

newton (N)

Conversions between Unit Systems

1lbf = 4.448 N

1N = 0.2248 lbf

Page 13: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Static Equilibrium Force Principles

Forces always occur in pairs acting on

two different objects.

Force pairs act in opposite directions

and have the same magnitude.

Page 14: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Force Components

A single force can be replaced by

component forces if their combination

produces the same effect as the

original force.

a

Fay

Fax

a

Page 15: Introduction to Statics - Amazon S3 · Statics Principles Newton’s Second Law of Motion: The acceleration of an object is proportional to the net force acting on the object and

Resultant Force

A single force that has the same effect

as two or more concurrent forces

2lbf 5lbf

5lbf

2lbf

7lbf

Resultant

3lbf

Resultant

=

=


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