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Aerospace Engineering
Forces and Elasticity
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24 Terms
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1
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How can force be calculated (spring constant, extension)
force \= spring constant x extension (F\=ke)
2
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What is force measured in
newtons (N)
3
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What is spring constant measured in
newtons per metre (N/m)
4
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What is extension measured in
metres (m)
5
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What happens when you apply a force to an object
it can compress, stretch or bend
6
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What must you do when applying a force if you want it to stay still
apply more than one force
7
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What is it called when an object changes shape
it has become deformed
8
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What are the two types of deformation
elastic, inelastic
9
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What is elastic deformation
the object changes back to its original shape after deformation
10
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What is inelastic deformation
the object stays deformed after deformation
11
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What is extension
the increase in length of a spring when it's stretched
12
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How can we measure extension
measure how the spring's length changes as we add downwards force
13
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What can happen to a spring before we even add force
mass will be exerting a downward force, weight, meaning there will already be some extension
14
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Why doesn't the spring fall down when you add mass
the solid support is exerting an equal opposite force
15
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What is spring constant
how many newtons it would take to stretch the object by 1m
16
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What is the relationship between spring constant and stiffness
the higher the spring constant, the stiffer the object (they require more force to stretch)
17
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What is Hooke's Law
the extension of an object is directly proportional to the force applied
18
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Why does the line start to curve in a force to extension graph
the elastic limit has been reached
19
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What happens after the elastic limit
Hooke's law does not apply, object becomes inelastically deformed
20
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How do you calculate elastic potential energy
elastic potential energy \= 1/2 x spring constant x extension^2 (E\=1/2ke^2)
21
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What is elastic potential energy
the energy transferred to an object as its being stretched
22
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What is the gradient in a force/extension graph equal to
spring constant
23
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What is the area under the curve in a force/extension graph equal to
energy transferred to the spring
24
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When a spring is released what is most of the elastic potential energy transferred to
kinetic energy
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