Voltage

The amount of energy carried by each electron

Current

The number of electrons flowing down a wire every second

Resistance

The tendency of a circuit element to reduce the energy carried by electrons.

Power

The amount of energy flowing down a wire every second.

Free Body Diagram

A diagram representing the different forces acting on an object as a series of arrows.

Force

Something exerted on an object by another object or a field that produces a tendency to move linearly.

Moment

Something exerted on an object by another object or a field that produces a tendency to rotate.

Vector

A kind of number that has a magnitude and a direction

Scalar

A normal number. Magnitude, no direction.

Static Determinacy

The condition of having the proper constraints on a truss in order for it to have one unique solution.

Member

A straight segment that connects two joints on a truss.

Joint

A point that connects two members on a truss.

Support

A place where a truss connects to the outside world. There are a variety of these, representing different forces and moments the outside world can exert on a truss

Reaction Force

A force exerted on a truss by the outside world that keeps a truss stationary despite having loads applied to it.

Load

A force exerted on a truss by the outside world. The purpose of a truss is to support these forces.

Elastic Deformation

Shape change that goes away after the force is removed (par of the graph before yield point)

Plastic Deformation

Shape change that remains after the force is removed

Stress

Axial Force divided by cross-sectional area

Strain

deformation divided by original length

Modulus of Elasticity

A material property that governs the relationship between stress and strain.

Yield Strength

The amount of stress required to start plastic deformation.

Ultimate Tensile Strength

The highest amount of stress a material can withstand.

Ductility / Fracture Strain

The most a material can deform before fracturing; (the last point on the graph)

(Modulus of) Resilience

The amount of energy a material can absorb before it starts plastic deformation; (area under graph before yield point)

(Modulus of) Toughness

The amount of energy a material can absorb before fracturing; (area under whole graph)

Hardness

The resistance of a material to plastic deformation

Interger

A positive or negative whole number, including 0

Floating Point Number

A numerical value with a decimal point

Boolean

True or False

Character

An individual letter, number, or symbol.

String

An array of letters, numbers, and/or symbols

==

Are these two things equal?

<

Is the first thing less than the second?

>

Is the first thing grater than the second?

<=

Is the first thing less than or equal to the second?

>=

Is the first thing grater than or equal to the second?

!=

Are these two things not equal?

&&

Are the first condition and the second condition both true?

||

Is either the first thing or second thing or both true?