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IED 2012 UNIT 5 KEY TERMS
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Gravity
PLTW: Introduction to Engineering Design
Terms in this set (36)
Acute Triangle
A triangle that contains only angles that are less than 90 degrees.
Angle
The amount of rotation needed to bring one line or plane into coincidence with another, generally measured in radians or degrees.
Area
The number of square units required to cover a surface.
Axis
1. An imaginary line through a body, about which it rotates. 2. An imaginary line about which a regular figure is symmetrically arranged. 3. A fixed reference line for the measurement of coordinates.
Center of Gravity
A 3D point where the total weight of the body may be considered to be concentrated.
Centroid
A 3D point defining the geometric center of a solid.
Circle
A round plane figure whose boundary consists of points equidistant from the center
Circumscribe
1. A triangle located round a polygon such as a circle. 2 To draw a figure around another, touching it at points but not cutting it.
Cylinder
A solid composed of two congruent circles in parallel planes, their interiors, and all the line segments parallel to the axis with endpoints on the two circles.
Density
The measure of mass density is a measure of mass per volume.
Diameter
A straight line passing from side to side through the center of a circle or sphere.
Ellipse
A shape generated by a point moving in a plane so that the sum of its distances from two other points (the foci) is constant and equal to the major axis
Fillet
A curve formed at the interior intersection between two or more surfaces.
Inscribe
To draw a figure within another so that their boundaries touch but do not intersect.
Mass
The amount of matter in an object or the quantity of the inertia of the object.
Meniscus
The curved upper surface of a liquid column that is concave when the containing walls are wetted by the liquid and convex when not.
Obtuse Triangle
A triangle with one angle that is greater than 90 degrees.
Parallelogram
A four-sided polygon with both pairs of opposite sides parallel.
Pi (π)
The numerical value of the ratio of the circumference of a circle to its diameter of approximately 3.14159.
Polygon
Any plane figure bounded by straight lines.
Principal Axes
The lines of intersection created from three mutually perpendicular planes, with the three planes' point of intersection at the centroid of the part.
Prism
A solid geometric figure whose two ends are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.
Quadrilateral
A four-sided polygon.
Radius
A straight line from the center to the circumference of a circle or sphere.
Rectangle
A parallelogram with 90 degree angles. A square is also a rectangle.
Regular Polygon
A polygon with equal angles and equal sides.
Right Triangle
A triangle that has a 90 degree angle.
Round
Two or more exterior surfaces rounded at their intersections.
Square
A regular polygon with four equal sides and four 90 degree angles.
Surface Area
The squared dimensions of the exterior surface
Tangent
A straight or curved line that intersects a circle or arc at one point only.
Title Block
A table located in the bottom right-hand corner of an engineering drawing that identifies, in an organized way, all of the necessary information that is not given on the drawing itself. Also referred to as a title strip.
Triangle
A polygon with three sides.
Vertex
Each angular point of a polygon, polyhedron, or other figure.
Volume
The amount of three-dimensional space occupied by an object or enclosed within a container.
Quadrilateral
A four-sided polygon.
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