For Quiz 01Week 1 Videos1. What is the primary task of an engineer? Engineering is the professional art requiring the judgment necessary to adapt knowledge to practical purposes, the imagination to conceive original solutions to problems, and the ability to predict performance and cost of new devices or processes.2. What is societal role of Engineering Mechanics? What does it enable you to do that isvaluable to society? Structural safety3. What is meant by Factor of Safety (or safety factor) ? Why should it be greater than 1? Safety Factor = supply/demand The safety factor needs to be greater than 1 to allow for uncertainty in the design process, such as calculations, strength of materials, duty and quality.4. What are the five major steps in structural analysis ? 1) Isolate Idealize and Draw FBD (judgment)2) Pictorial to vectorial: Math + Physics (basic math and physics) equations of motion and equilibrium3) Analyze and augment with empirical laws (Judgment)4) Combine and calculate (math)5) Check and conclude (decide)5. Why do we need to convert a real world situation into a symbolic representation? Mathematical reasoning to justify decisions (mathematical reasoning that everyone around the world understands and recognizes)6. What is a free body diagram? Simplified representation of the system. Free-body diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.7. What are the two kinds of forces that are included in a free body diagram? give examples of each2 [Type text]External Forces/Body force, gravity EX: Body A is touching body B8. What is the difference between a “motive force” and a “constraint ” or reaction force?Motive Force- Cause acceleration/known at FBD drawing timeConstraint or reaction forces- prevent relative motion/unknown at FBD motion9. What motion is allowed for each of the following 2-D joints? Welded Joint, Pin Joint, Roller or rocker Joint? Welded- no motionPin joint- roll in placeRoller joint- heave and swayRocker joint- fixed joint = normal force10. What force or moment(s) are zero for each of these 2-D joints? Welded , Pin, Roller? 11. Do we include internal forces in a FBD?
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