Mechanical Engineering Exam 1 Questions & Answers Already Graded A+

Machine - Answer--A device that uses energy to do work to accomplish some desired activity -They do not produce energy, but they do transmit and transform energy -Machines can transmit a force, control its motion, and change its direction -A machine is a system of components Component - Answer-A small piece that makes up a larger whole. Each component is there for a specific job, but the sum of components System - Answer-A combination of components Mechanical Engineering - Answer--The designing of machines that contribute to society and our quality of life -Mechanical engineers apply the principles of mathematics, chemistry, and physics to solve real-world problems Dimension - Answer--Describes a physical property of anything -What we are measuring Base Dimensions - Answer--Are independent of other dimensions -They are limited in number -length, mass, time, temperature, force Derived Dimension - Answer--Derived from, or composed of, base dimensions i.e. Area (length x width), Weight (mass x acceleration), velocity (length/time) System International (SI) - Answer-The standard system of units that uses base 10 and used in the rest of the world. -US does not use, but Great Britain does-Base Units: mass-kilograms (kg), length-meters (m), and time-Seconds (S) -Force is a derived unit measured in newtons (N) US Customary - Answer-A system adopted from an old British system of units in the 13th century -Engineering system -Units: length-foot (ft), time-second (s), force-(lbs) -Mass is a derived unit called a slug -Political/Economic choice -Awkward Length - Answer-The magnitude of something in a particular direction Mass - Answer--The amount of atoms and molecules in something -Matter is energy that has become solid -An object gains mass when it gains more energy and vice a versa -Units: SI-kgs and USA: Slugs, lbs