PLTW Final Exam 2024 Questions & Answers 100% Correct!

PLTW Final Exam 2024 Questions & Answers 100% Correct! Precision - ANSWEREngineers communicate precisely to others Use clear definitions State the meaning of variables Are careful about specifying units Calculate accurately Express answers with a degree of precision appropriate for the problem context Why is it important to use constraints when sketching with your 3D modeling program? - ANSWERBecause constraints allow you to move shapes accordingly in order to best represent the object you are sketching. Why are some constraints automatically applied by the software, but you must manually apply others? - ANSWERBecause some shapes come with automatic constraints. Squares for instance, have two sets of parallel sides and all sides are equal in length. Fillet - ANSWERA curve formed at the interior intersection between two or more surfaces. Explain the difference between weight and mass. - ANSWERWeight is the force of gravity acting upon an object, while mass is the quantity of matter in an object. Density - ANSWERa measure of the amount of matter per unit of volume Matter: Mass vs. Weight - ANSWERMass is the amount of matter in an object or the quantity of the inertia of the object. Weight is the force of gravity on mass. W = weight m = mass g = acceleration of gravity SI units weight and mass - ANSWERmass = kilograms and weight = newtons Us Customary weight and mass - ANSWERmass = slugs, more commonly pound-mass(lb^m) 1 lbm = 0. kg and weight = pounds How are pound-mass and pound-force related? - ANSWEROn Earth (g = 32.174 ft/s2): 1 pound-mass object weighs 1 pound-force In outer space (no gravity): 1 pound-mass object has no weight On the moon (g = 5.32 ft/s2): 1 pound-mass object weighs 0.166 pound-force How can density be indicated? - ANSWERMass density and weight density M