1456583
Descripción
Test por Nicole Saville, actualizado hace más de 1 año
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Creado por Nicole Saville
hace alrededor de 10 años
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Pregunta 1
Pregunta
What is Hooke's Law?
Respuesta
-
F=kx
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k=Fx
-
The extension of an elastic body is proportional to the force that causes it (within its elastic limit)
-
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
Pregunta 2
Pregunta
In Hooke's law, what is k?
Respuesta
-
The spring constant
-
Extension
-
The length
Pregunta 3
Pregunta
How do you find the spring constant from a Force- extension graph?
Respuesta
-
1 ----------- gradient
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gradient
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area underneath
Pregunta 4
Pregunta
What does the area underneath a force-extension graph tell you?
Respuesta
-
The strain energy
-
The strain
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The stress
-
The spring constant
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Nothing
Pregunta 5
Pregunta
What is strain energy?
Respuesta
-
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
Pregunta 6
Pregunta
Ultimate tensile strength is...
Respuesta
-
the maximum tensile force that can be applied to a material before it breaks
-
the energy stored in a material when it's stretched to its limit
-
the maximum stress of a material
Pregunta 7
Pregunta
tensile force is a force applied to create a stretch
Respuesta
- True
- False
Pregunta 8
Pregunta
Stress =
Respuesta
-
force/area
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force x area
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force applied per unit cross sectional area
-
measured in Pa
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measured in Nm^-2
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the fractional change in length under load
Pregunta 9
Pregunta
Fractional change in length under load =
Respuesta
-
Stress
-
Strain
-
Young modulus
-
Strain energy
Pregunta 10
Pregunta
Strain is measured in N/m
Respuesta
- True
- False
Pregunta 11
Pregunta
extension/length =
Respuesta
-
stress
-
strain
-
young modulus
Pregunta 12
Pregunta
What's the effective spring constant of springs in parallel?
Respuesta
-
k1 + k2
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1/K1 + 1/K2
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k1 x k2
Pregunta 13
Respuesta
-
top - series bottom - parallel
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top - parallel bottom - series
Pregunta 14
Pregunta
How do you find the effective spring constant of two springs in series?
Respuesta
-
1/K = 1/k1 + 1/k2
-
1/k = k1 x k2
-
k = k1 + k2
Pregunta 15
Pregunta
What is a ductile material?
Respuesta
-
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
Pregunta 16
Pregunta
Brittle materials distort very little and fracture beyond their elastic limit
Respuesta
- True
- False
Pregunta 17
Respuesta
-
brittle material
-
ductile material
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elastic material
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polymeric material
Pregunta 18
Pregunta
What's the equation for strain energy?
Respuesta
-
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
Pregunta 19
Pregunta
What is the young modulus?
Respuesta
-
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
-
The maximum force a material can withstand before fracturing
Pregunta 20
Pregunta
A material with a small young modulus is stiff
Respuesta
- True
- False
Pregunta 21
Pregunta
On a stress-strain graph what is the yield point?
Respuesta
-
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
Pregunta 22
Pregunta
On a stress-strain graph what is the limit of proportionality?
Respuesta
-
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
Pregunta 23
Pregunta
Plastic deformation is reversible and disappears when the load is removed
Respuesta
- True
- False
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