1456583
Description
Question 1
Question
What is Hooke's Law?
Answer
-
F=kx
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k=Fx
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The extension of an elastic body is proportional to the force that causes it (within its elastic limit)
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The force on a body is proportional to the extension caused once past the elastic limit
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Force is proportional to strain
Question 2
Question
In Hooke's law, what is k?
Answer
-
The spring constant
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Extension
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The length
Question 3
Question
How do you find the spring constant from a Force- extension graph?
Answer
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1 ----------- gradient
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gradient
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area underneath
Question 4
Question
What does the area underneath a force-extension graph tell you?
Answer
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The strain energy
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The strain
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The stress
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The spring constant
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Nothing
Question 5
Question
What is strain energy?
Answer
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Energy stored in deformed materials
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Work done in producing an extension
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The maximum force a material can take before breaking
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The point at which a material reaches its elastic limit
Question 6
Question
Ultimate tensile strength is...
Answer
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the maximum tensile force that can be applied to a material before it breaks
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the energy stored in a material when it's stretched to its limit
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the maximum stress of a material
Question 7
Question
tensile force is a force applied to create a stretch
Answer
- True
- False
Question 8
Question
Stress =
Answer
-
force/area
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force x area
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force applied per unit cross sectional area
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measured in Pa
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measured in Nm^-2
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the fractional change in length under load
Question 9
Question
Fractional change in length under load =
Answer
-
Stress
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Strain
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Young modulus
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Strain energy
Question 10
Question
Strain is measured in N/m
Answer
- True
- False
Question 11
Question
extension/length =
Answer
-
stress
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strain
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young modulus
Question 12
Question
What's the effective spring constant of springs in parallel?
Answer
-
k1 + k2
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1/K1 + 1/K2
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k1 x k2
Question 13
Answer
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top - series bottom - parallel
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top - parallel bottom - series
Question 14
Question
How do you find the effective spring constant of two springs in series?
Answer
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1/K = 1/k1 + 1/k2
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1/k = k1 x k2
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k = k1 + k2
Question 15
Question
What is a ductile material?
Answer
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materials that have a large plastic region and can therefore be drawn into wires
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Image:ductile_material (image/png)
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Image:elastic (image/jpg)
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Materials that have a very small elastic limit and therefore break easily
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Materials that are very stretchy
Question 16
Question
Brittle materials distort very little and fracture beyond their elastic limit
Answer
- True
- False
Question 17
Answer
-
brittle material
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ductile material
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elastic material
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polymeric material
Question 18
Question
What's the equation for strain energy?
Answer
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E=1/2Fx
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E=1/2kx^2
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E=1/kx
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E=kFx/2
Question 19
Question
What is the young modulus?
Answer
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A constant for a given material
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Stress/strain
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Fl/Ax
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the stiffness of a material
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The maximum force a material can withstand before fracturing
Question 20
Question
A material with a small young modulus is stiff
Answer
- True
- False
Question 21
Question
On a stress-strain graph what is the yield point?
Answer
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The point from which the force required to stretch a material decreases
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The point from which the force required to stretch a material increases
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The elastic limit
Question 22
Question
On a stress-strain graph what is the limit of proportionality?
Answer
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The elastic limit, above which plastic deformation occurs
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The elastic limit, above which elastic deformation occurs
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The maximum force applied to a material before it breaks
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The point at which a material fractures
Question 23
Question
Plastic deformation is reversible and disappears when the load is removed
Answer
- True
- False
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