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Quiz von Nicole Saville, aktualisiert more than 1 year ago
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Erstellt von Nicole Saville
vor etwa 10 Jahre
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Frage 1
Frage
What is Hooke's Law?
Antworten
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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
Frage 2
Frage
In Hooke's law, what is k?
Antworten
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The spring constant
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Extension
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The length
Frage 3
Frage
How do you find the spring constant from a Force- extension graph?
Antworten
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1 ----------- gradient
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gradient
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area underneath
Frage 4
Frage
What does the area underneath a force-extension graph tell you?
Antworten
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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
Frage 5
Frage
What is strain energy?
Antworten
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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
Frage 6
Frage
Ultimate tensile strength is...
Antworten
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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
Frage 7
Frage
tensile force is a force applied to create a stretch
Antworten
- True
- False
Frage 8
Frage
Stress =
Antworten
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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
Frage 9
Frage
Fractional change in length under load =
Antworten
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Stress
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Strain
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Young modulus
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Strain energy
Frage 10
Frage
Strain is measured in N/m
Antworten
- True
- False
Frage 11
Frage
extension/length =
Antworten
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stress
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strain
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young modulus
Frage 12
Frage
What's the effective spring constant of springs in parallel?
Antworten
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k1 + k2
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1/K1 + 1/K2
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k1 x k2
Frage 13
Antworten
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top - series bottom - parallel
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top - parallel bottom - series
Frage 14
Frage
How do you find the effective spring constant of two springs in series?
Antworten
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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
Frage 15
Frage
What is a ductile material?
Antworten
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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
Frage 16
Frage
Brittle materials distort very little and fracture beyond their elastic limit
Antworten
- True
- False
Frage 17
Antworten
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brittle material
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ductile material
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elastic material
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polymeric material
Frage 18
Frage
What's the equation for strain energy?
Antworten
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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
Frage 19
Frage
What is the young modulus?
Antworten
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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
Frage 20
Frage
A material with a small young modulus is stiff
Antworten
- True
- False
Frage 21
Frage
On a stress-strain graph what is the yield point?
Antworten
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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
Frage 22
Frage
On a stress-strain graph what is the limit of proportionality?
Antworten
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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
Frage 23
Frage
Plastic deformation is reversible and disappears when the load is removed
Antworten
- True
- False
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