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WorksheetsPOE Unit 2
Total questions: 62
Worksheet time: 1hrs 1mins
Given that the centroid of a right triangle is located at a distance of 1/3 its height and 1/3 its base, find the location of centroid of the triangle above if the B = 12 and H = 9.
(12, 9)
(4, 3)
(3, 4)
(9, 12)
TRUE or FALSE: in symmetrical objects, the centroid is determined by an object's line of symmetry.
True
False
The centroid of an object is...
its center of gravity or center of mass
its center point
its balancing point
Does the top plank or bottom plank seem to have a higher modulus of elasticity?
Top plank
Bottom plank
They are the same
A LOW modulus of elasticity means...
a greater resistance to deformation
a lower resistance to deformation
a greater resistance to strain
a lower resistance to strain
Which board has a higher moment of inertia?
Board A
Board B
They both have the same
Using the equation for the moment of inertia, find the base of a piece of wood that has moment of inertia 21 and height 5.5.
1.5
2
1
15
A higher moment of inertia produces a...
greater resistance to deformation
lesser resistance to deformation
greater resistance to stiffness
lesser resistance to stiffness
The measure of the stiffness of an object relative to its shape is called its...
moment of inertia
moment
hardness
A bridge member that is in tension is...
being stretched
being squeezed
A bridge member that is in compression is...
being stretched
being squeezed
TRUE OR FALSE:
A moment is equal to the force times the parallel distance from the pivot point to where that force is acting.
True
False
Determine the Moment about point O.
21 kN⋅m CCW
21 kN⋅m CW
28 kN⋅m CCW
28 kN⋅m CW
14 kN⋅m CCW
Consider the following forces, what additional force is needed to keep the block in static equilibrium?
9N force pointing up
9N force pointing down
16N force pointing down
16N force pointing up
This type of forming involves pouring or forcing softened material into a hollow mold.
rolling
casting
extruding
The 500 lb force causes a ____ moment about point A.
positive
negative
maximum
neutral
Which measurement impacts an objects Moment of Inertia more heavily?
Base
Height
Width
Depth
If your spaghetti bridge begins to bend or sag we can say it is experiencing ...
deflection
torsion
deformation
Tension is a force that..
pulls
stresses
compresses
Describe the relationship between the maximum beam deflection and the length of the beam. Are the two directly related? Inversely related? Not related?
Directly Related: As the length of the beam increases, so does the maximum beam deflection.
Inversely Related: As the length of the beam increases, the maximum beam deflection decreases, and vice versa.
Not related
Why does a beam's orientation change it's Moment of Inertia? (Choose the BEST option)
You are changing what the measured Height is, which heavily impacts Inertia Calculations
You are changing the measured Base, which heavily impacts Inertia Calculations
You are changing the beam's length, which heavily impacts Inertia Calculations
Beam orientation doesn't matter, the Moment of Inertia stays the same.
What does the Modulus of Elasticity describe?
An objects stiffness based on its shape
An objects stiffness based on its chemical properties
An objects rotation because of inertia
An objects rotation because of force
What does the Moment of Inertia describe?
An objects stiffness related to its shape
An objects stiffness related to its chemical properties
An objects rotation because of inertia
An objects rotation because of force
A mathematical property of a cross section (measured in in^^4) that gives important information about how the cross-sectional area is distributed about a centroidal axis
Modulus of Elasticity
Moment of Inertia
Centroid
Moment
The SENSE of a Vector is
indicated by the length of the line
has magnitude & direction
indicated by the direction of the arrow
a twisting effort about a point when a force is applied
Geometric center of an object
joint
vector
centroid
moment
Quantity with both magnitude and direction
scalar
vector
moment
centroid
If given a complex shape how do you find the true centroid?
Break it into smaller shapes and add the centroid locations together
Break it into smaller shapes and average the centroid locations
Break it into large shapes and subtract the smallest from the largest
Multiply the centroid locations with the shape area, add the products up, divide by total shape area
What is the centroid of the following object?
X=0.85 in, Y=2 in
X=2 in, Y=0.85 in
X=2 in, Y=1.7 in
X=1.7 in, Y=2 in
What is the centroid of the following object?
X=1.27 in, Y=3 in
X=3 in, Y=1.27 in
X=3 in, Y=3 in
X=2.55 in, Y=3 in
What is the centroid of the following object?
X=0.375 in, Y=0.25 in
X=0.25 in, Y=0.375 in
X=0.75 in, Y=0.5 in
X=0.25 in, Y=0.17 in
What is the centroid representing?
The object's center of gravity.
The object's dimensions.
The object's X and Y.
The object's shape.
What should we try to do with materials when we are finished with them?
Eat them
Recycle them
Throw them away
Burn them
A material that does not allow heat to travel is
An electrical conductor
An electrical insulator
A thermal conductor
A thermal insulator
A material that allows heat to travel through it is
An electrical conductor
An electrical insulator
A thermal conductor
A thermal insulator
Which of these materials is a good conductor of heat?
Wood
Ceramic
Metal
Which of these are metals?
gold
plastic
glass
What manufacturing process is shown?
turning
3D printing
extrusion
rolling
A manufacturing process where two or more materials are assembled together.
forming
casting
molding
joining
machining
Product Life Cycle Inventory can quantify atmospheric emission to create a product.
True
False
Which is the following is NOT part of a life cycle analysis?
Using the product.
Obtaining and processing raw materials.
Advertising a product.
Disposing of the product
What is the final step in LCA process?
Disposal
Manufacturing
Distribution
Raw material extraction
These are the symbols usually found on the bottom of plastic objects, which two usually indicate that an object is recyclable?
These symbols are often found on the bottom of different plastic objects. What do they mean?
They tell you the type of plastic and tells you whether or not it can be recycled
They tell you how long the product will last.
They tell you when the product was made.
They tell you which recycling bin it goes in.
Unrecoverable elongation beyond the elastic limit.
Resilience
Yield Point
Elastic Limit
Plastic Deformation
Which of the following is the correct symbol to represent Stress?
σ (Lowercase Sigma)
ε (lowercase Epsilon)
δ (Lowercase Delta)
ψ (Lowercase Psi)
How is stress calculated?
Number of sleepless nights divided by number of cups of coffee
Divide load (F) by the original test sample cross-sectional area (A0).
Elongation (δ) under load divided by the original Length (L0)
Stress (σ) divided by strain (ε)
A tensile test is what type of test?
Destructive Test
Constructive Test
Compression test
Hardness Test
name the parts of the graph E
stress
strain
fracture point
elasticity range
name the parts of the graph G
stress
strain
fracture point
elasticity range
name the parts of the graph B
stress
strain
fracture point
elasticity range
What property best describes the ability to be stretched and return to original shape?
elasticity
conductor
hardness
brittleness
