Behaviour of springs Flashcards

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1
Q

By compressive force, the spring…

A

is squashed.

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2
Q

By tensile force, the spring…

A

is stretched.

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3
Q

Restoring force is when…

A

spring applies equal but opposite force on the person applying the force.

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4
Q

Hook’s law states:

A

The extension of spring is directly proportional to the force applied until the limit of proportionality is not exceeded.

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5
Q

F=

A

kx - spring constant x extension

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6
Q

Limit of proportionality is a point…

A

beyond which behaviour no longer obeys Hook’s law.

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7
Q

Elastic limit is a point…

A

beyond which the spring will no longer return to its original shape when the force is removed.

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8
Q

Elasticity is…

A

the ability to regain shape after deforming forces are removed.

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9
Q

The Young modulus is…

A

the ration of stress to strain for a material obeying Hook’s law.

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10
Q

Stress=

A

F/A

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11
Q

Strain=

A

extension/length

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12
Q

Young modulus=

A

stress/strain

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13
Q

Stress-strain graph:

A
  • a gradient is a young modulus

- the area represents the energy absorbed by the material

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14
Q

The yield point is large…

A

increase in the extension of a material when the stress is increased beyond the elastic limit.

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15
Q

UTS is…

A

Ultimate tensile stress, maximum stress experienced before breaking (per unit C.S.A.)

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16
Q

Plastic deformation is…

A

deformation that is permanent after removal of the load.

17
Q

A thick rod is harder to compress as…

A

the surface area is larger-more stress must be applied.

18
Q

Increase in young modulus or A causes…

A

decrease in ΔL

19
Q

Increase in original length causes…

A

increase in ΔL

20
Q

Stiffness reflects…

A

how difficult is to change the shape of a material.

21
Q

Strength is…

A

the maximum tensile stress before breaking.

22
Q

Toughness is energy…

A

needed to break material(area under a stress-strain curve)

23
Q

Elastic potential energy is…

A

energy stored in a body due to a load causing deformation.

24
Q

Work must be done to store…

A

EPE.

25
Q

EPE=

A

F x extension

26
Q

Work done can be found as an area under…

A

force/distance graph.

27
Q

Work done(spring)=

A

0.5 x k x extention2

28
Q

Springs in series:

A

k= 1/k1 + 1/k2

29
Q

Springs in parallel:

A

k=k1 + k2