PLTW principles of engineering

effort force

input force applied to a machine

resistance force

output force applied by a machine

effort distance

the distance traveled by the effort force at the input of a machine

resistance distance

the distance traveled by the resistance force at the output of a machine

force

A push or pull exerted on an object

simple machine

A machine that does work with only one movement

Lever

a simple machine that consists of a bar that pivots at a fixed point called a fulcrum

Inclined plane

a simple machine that is a flat, sloped surface.

Pulley

A simple machine that consists of a rope that fits into a groove in a wheel

Wheel and Axle

a simple machine consisting of two circular objects of different sizes; the wheel is the larger of the two circular objects

Screw

A simple machine that is an inclined plane wrapped around a central cylinder to form a spiral

Wedge

a simple machine that is an inclined plane that moves

Gears

Chain and Sprocket

Speed

Circumference

Angular Velocity

Motors

Complex machine

Vectors

Electricity

Voltage

Current

Work

Power

Energy

Moment

Beam deflection

Center of mass

Moment of inertia

Statics

Free body diagrams

Particle Model

Rigid body model

Truss

Modulus of Elasticity

Degrees of freedom

Elastic

Plastic deformation

Stress

Strain

Stress-strain curve

Static determinacy

Heat

Compression

Tension

Buckling

Thermal radiation

Thermal convection

R-value

Solar radiation

Controls

Programming

Variables

Inputs

Outputs

Sensors

Actuators

Data types

Conditions

Iteration

Sequences

Sequential programming

Procedural programming

Functional programming

Object oriented programming

Open loop control

Closed loop control

Truth table

Decision matrix

Requirement