Properties of Geometric Solids Calculating Volume, Weight, and Surface Area

Properties of Geometric Solids Introduction to Engineering Design TM Unit 1 – Lesson 1.4 – Geometric Shapes and Solids Geometric Solids Solids are three-dimensional objects. In sketching, two-dimensional shapes are used to create the illusion of three-dimensional solids. Identify the Shapes in all pictures Project Lead The Way, Inc. Copyright 2007

Properties of Solids Volume, mass, weight, density, and surface area are properties that all solids possess. These properties are used by engineers and manufacturers to determine material type, cost, and other factors associated with the design of objects.

Volume Volume (V) refers to the amount of space occupied by an object or enclosed within a container. Metric English System cubic cubic inch centimeter (cc) (in3)

Volume of a Cube V = s3 A cube has sides (s) of equal length. The formula for calculating the volume (V) of a cube is: V = s3 V= s3 V= 4 in x 4 in x 4 in V = 64 in3

Volume of a Rectangular Prism A rectangular prism has at least one side that is different in length from the other two. The sides are identified as width (w), depth (d), and height (h).

V = wdh Volume of a Rectangular Prism The formula for calculating the volume (V) of a rectangular prism is: V = wdh V= wdh V= 4 in x 5.25 in x 2.5 in V = 52.5 in3

Volume of a Cylinder To calculate the volume of a cylinder, its radius (r) and height (h) must be known. The formula for calculating the volume (V) of a cylinder is: V = r2h V= r2h V= 3.14 x (1.5 in)2 x 6 in V = 42.39 in3

Mass Mass (M) refers to the quantity of matter in an object. It is often confused with the concept of weight in the metric system. Metric English System gram slug (g)

Weight Weight (W) is the force of gravity acting on an object. It is often confused with the concept of mass in the English system. Metric English System Newton pound (N) (lb)

Mass vs. Weight Contrary to popular practice, the terms mass and weight are not interchangeable, and do not represent the same concept. W = Mg weight = mass x acceleration due to gravity (lbs) (slugs) (ft/sec2) g = 32.16 ft/sec2

Mass vs. Weight An object, whether on the surface of the earth, in orbit, or on the surface of the moon, still has the same mass. However, the weight of the same object will be different in all three instances, because the magnitude of gravity is different.

Mass vs. Weight Each measurement system has fallen prey to erroneous cultural practices. In the metric system, a person’s weight is typically recorded in kilograms, when it should be recorded in Newtons. In the English system, an object’s mass is typically recorded in pounds, when it should be recorded in slugs.

Weight Density Weight density (WD) is an object’s weight per unit volume. English System pounds per cubic inch (lbs/in3)

Weight Density Substance Weight Density Water Freshwater Seawater Gasoline Aluminum Machinable Wax Haydite Concrete .036 lb/in3 .039 lb/in3 .024 lb/in3 .098 lb/in3 .034 lb/in3 .058 lb/in3

Calculating Weight To calculate the weight (W) of any solid, its volume (V) and weight density (Dw) must be known. W = VDw W = VDw W = 36.75 in3 x .098 lbs/in3 W = 3.6 lbs

Area vs. Surface Area There is a distinction between area (A) and surface area (SA). Area describes the measure of the two-dimensional space enclosed by a shape. Surface area is the sum of all the areas of the faces of a three-dimensional solid.

Surface Area Calculations In order to calculate the surface area (SA) of a cube, the area (A) of any one of its faces must be known. The formula for calculating the surface area (SA) of a cube is: SA = 6A SA = 6A SA = 6 x (4 in x 4 in) SA = 96 in2

Surface Area Calculations In order to calculate the surface area (SA) of a rectangular prism, the area (A) of the three different faces must be known. SA = 2(wd + wh + dh) SA = 2(wd + wh + dh) SA = 2 x 44.125 in2 SA = 88.25 in2

Surface Area Calculations In order to calculate the surface area (SA) of a cylinder, the area of the curved face, and the combined area of the circular faces must be known. SA = (2r)h + 2(r2) SA = 2(r)h + 2(r2) SA = 56.52 in2 + 14.13 in2 SA = 88.25 in2