PreK-12 Engineering
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P-S

Pitch
The property of a sound and especially a musical tone that is determined by the frequency of the waves producing it highness or lowness of sound.
Precipitation
A deposit on the earth of hail, mist, rain, sleet or snow; also the quantity of water deposited.
Process
Human activities used to create, invent, design, transform, produce, control, maintain and use products or systems. A systematic sequence of actions that combines resources to produce an output.
Producer
Any of various organisms (such as a green plant) that produce their own organic compounds from simple precursors (such as carbon dioxide and inorganic nitrogen) and many of which are food sources for other organisms..
Prototype
A full-scale working model used to test a design concept by making actual observations and necessary adjustments.
Reflection
The return of light or sound waves from a surface.
Refraction
Deflection from a straight path undergone by a light ray or energy wave in passing obliquely from one medium (as air) into another (as glass) in which its velocity is different.
Resource
In a technological system, the basic technological resources are energy, capital, information, machines and tools, materials, people and time.
Revolve
To move in a curved path around a center or axis.
Rotate
To turn about and axis or a center.
Sedimentary Rocks
Rocks formed from material, including debris of organic origin, deposited as sediment by water, wind or ice and then consolidated by pressure.
Sketch
A rough drawing that represents the main features of an object or scene and often used as a preliminary study.
Solar System
A star (as the Sun) together with a group of celestial bodies that are held by its attraction and that revolve around it.
Solid
A substance that does not flow perceptibly under moderate stress, has a definite capacity for resisting forces (as compression and tension) that tend to deform it, and under ordinary conditions, retains a definite size and shape.
Synthetic Material
Material that is not found in nature, such as Styrofoam, concrete or plastics.
System
A group of interacting, interrelated or independent elements or parts that function together as a whole to accomplish a goal.
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