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PLTW Biomed Final Exam
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PLTW Biomed Final Exam
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PLTW Final ExamPrecision - ANSWER Engineers 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? - ANSWER Because 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? - ANSWER Because some shapes come with automatic
constraints. Squares for instance, have two sets of parallel sides and all sides are
equal in length.
Fillet - ANSWER A curve formed at the interior intersection between two or more
surfaces.
Explain the difference between weight and mass. - ANSWER Weight is the force of
gravity acting upon an object, while mass is the quantity of matter in an object.
Density - ANSWER a measure of the amount of matter per unit of volume
Matter: Mass vs. Weight - ANSWER Mass 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 - ANSWER mass = kilograms and weight = newtons
Us Customary weight and mass - ANSWER mass = slugs, more commonly pound-
mass(lb^m) 1 lbm = 0.45359237 kg and weight = pounds
How are pound-mass and pound-force related? - ANSWER On 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? - ANSWER Mass density and weight density
, Mass/Weight Density - ANSWER Mass Density commonly used for SI units
g/cm3 or kg/m3
Weight Density commonly used for U.S. Customary units
lb/in.3 or lb/ft3
Balance—measures mass - ANSWER Uses objects of known mass to find the
unknown mass of an object
Measurement is unaffected by difference in gravity
Scale—measures weight - ANSWER Measures force caused by gravity
Measurement is affected by difference in the acceleration of gravity
May display a "mass" measurement reading by using an assumed acceleration of
gravity to convert from weight to mass
Volume: Measurement - ANSWER Volume is the amount of three dimensional
space enclosed by an object.
Finding Volume:
Calculate using geometry of object
Measure indirectly using water displacement (or 3D scanner)
Surface area - ANSWER is the sum of all the areas of the faces of a three-
dimensional solid.
Types of forces - ANSWER Contact and action-at-distance
Contact forces - ANSWER result when two object physically touch each other. No
contact force if objects don't touch
Action-at-distance forces - ANSWER result even when tow interacting object are not
physically in contact. Gravity is an action at a distance force.
Applied contact forces - ANSWER because one object applies a force to another
object
A force that resists the contact pull of gravity toward the center of the earth is called -
ANSWER Contact force
Normal Force - ANSWER A contact force that results when an object rests on a
surface, always acts perpendicular to the supporting force
Friction - ANSWER Resists a sliding movement
Free body diagram - ANSWER It represents all of the forces acting on an object
Vectors - ANSWER Arrows representing forces, the length of arrow represents the
magnitude of the force
Static equalibrium - ANSWER Object is not moving in any direction
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