1456583
Descrição
Quiz por Nicole Saville, atualizado more than 1 year ago
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Criado por Nicole Saville
aproximadamente 10 anos atrás
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Questão 1
Questão
What is Hooke's Law?
Responda
-
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
Questão 2
Questão
In Hooke's law, what is k?
Responda
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The spring constant
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Extension
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The length
Questão 3
Questão
How do you find the spring constant from a Force- extension graph?
Responda
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1 ----------- gradient
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gradient
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area underneath
Questão 4
Questão
What does the area underneath a force-extension graph tell you?
Responda
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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
Questão 5
Questão
What is strain energy?
Responda
-
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
Questão 6
Questão
Ultimate tensile strength is...
Responda
-
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
Questão 7
Questão
tensile force is a force applied to create a stretch
Responda
- True
- False
Questão 8
Questão
Stress =
Responda
-
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
Questão 9
Questão
Fractional change in length under load =
Responda
-
Stress
-
Strain
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Young modulus
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Strain energy
Questão 10
Questão
Strain is measured in N/m
Responda
- True
- False
Questão 11
Questão
extension/length =
Responda
-
stress
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strain
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young modulus
Questão 12
Questão
What's the effective spring constant of springs in parallel?
Responda
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k1 + k2
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1/K1 + 1/K2
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k1 x k2
Questão 13
Responda
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top - series bottom - parallel
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top - parallel bottom - series
Questão 14
Questão
How do you find the effective spring constant of two springs in series?
Responda
-
1/K = 1/k1 + 1/k2
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1/k = k1 x k2
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k = k1 + k2
Questão 15
Questão
What is a ductile material?
Responda
-
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
Questão 16
Questão
Brittle materials distort very little and fracture beyond their elastic limit
Responda
- True
- False
Questão 17
Responda
-
brittle material
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ductile material
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elastic material
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polymeric material
Questão 18
Questão
What's the equation for strain energy?
Responda
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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
Questão 19
Questão
What is the young modulus?
Responda
-
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
Questão 20
Questão
A material with a small young modulus is stiff
Responda
- True
- False
Questão 21
Questão
On a stress-strain graph what is the yield point?
Responda
-
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
Questão 22
Questão
On a stress-strain graph what is the limit of proportionality?
Responda
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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
Questão 23
Questão
Plastic deformation is reversible and disappears when the load is removed
Responda
- True
- False
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