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Design & Technology > 8. Forces and stresses > Flashcards

8. Forces and stresses Flashcards

1
Q

What is compression?

A

Forces that are trying to crush or shorten

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1
Q

What is tension?

A

forces pulling in opposite directions

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2
Q

What is bending?

A

flexing force

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3
Q

What is torsion?

A

twisting force

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4
Q

What is shear?

A

a strain produced when an object is subjected to opposing forces

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5
Q

What is a fair test for tension?

A

apply the same weight to each material and suspended in the same manner

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6
Q

What is a fair test for compression?

A

insert materials into a vice/clamp and apply the same amount of twists to the handle

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7
Q

What is a fair test for bending?

A

flexing force

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8
Q

What is a fair test for torsion?

A

twisting force

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9
Q

What is a fair test for shear?

A

place the material between a tool that works in opposite directions e.g shears

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10
Q

How can a material/object be adapted to resist tension?

A

concrete can have steel bars inserted to reinforce

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11
Q

How can a material/object be adapted to resist compression?

A

composite panels can have a honeycomb structure sandwiched in the middle to resist

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12
Q

How can a material/object be adapted to resist bending?

A

steel beams have an I profile to resist bending

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13
Q

How can a material/object be adapted to resist torsion?

A

the diagonals on a tower crane help the structure against torsion

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14
Q

How can a material/object be adapted to resist shear?

A

bolts are hardened and have unthreaded shanks to help stop shearing

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15
Q

What is lamination?

A

layering of thin materials

16
Q

What is bending/folding?

A

Folding a 90 degree edge on a sheet metal plastic

17
Q

What is webbing?

A

Modern Polymer fabrics woven together

18
Q

What is fabric interfacing?

A

a strengthening material added to the unseen face of a fabric

19
Q

What is the result of lamination?

A

it can make boards stiffer or actually more flexible, depending on the direction of lamination

20
Q

What is the result of bending/folding?

A

makes the panel more rigid

21
Q

What is the result of webbing?

A

extremely strong and durable fabric

22
Q

What is the result of fabric interfacing?

A

adds strength/shape

23
Q

What is an example of where lamination is used?

A

plywood

24
Q

What is an example of where bending/folding is used?

A

body panels on cars

25
Q

What is an example of where webbing is used?

A

seat belts

26
Q

What is an example of where fabric interfacing is used?

A

shirt collars

27
Q

What does the seasoning of timber do?

A

removes the moisture content so that the timber will not shrink, warp and twist

28
Q

What does the annealing (heating) of copper do?

A

softens the copper to make it more malleable

29
Q

What does the addition of stabilisers in PVC do?

A

stops plastic becoming brittle with exposure to the sun

Design & Technology (15 decks)

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