| Date | May 2022 | Marks available | 2 | Reference code | 22M.2.SL.TZ0.2 |
| Level | SL | Paper | 2 | Time zone | no time zone |
| Command term | Outline | Question number | 2 | Adapted from | N/A |
Question
Ropes are used for a variety of purposes such as rock climbing, yachting and securing loads to trucks. Figure 4 shows the internal structure of a rope.
Figure 4: The internal structure of rope
Outline why fibres are important for the strength and flexibility of the rope.
List two properties that enable rope to maintain its strength.
Markscheme
individual fibres are flexible (but lack strength);
fibres woven/braided together provide high tensile strength;
Award [1] for identifying one reason why rope fibres are important for the strength and flexibility of the rope and [1] for a development up to [2 max].
high tensile strength;
elasticity;
Award [1] for listing each property that enables rope to maintain its strength up to [2 max].
Examiners report
A very difficult question with illustrations and stem information which showed fibres, strands and yarns that did not help the students. Very few achieved a mark with almost no one achieving two marks. Many repeated the question in their answer which was easy to do as it referred to strength and flexibility.
Another 'list two' with many candidates listing high tensile strength but not many listing elasticity.
Syllabus sections
- 20N.1.HL.TZ0.15: What property does a material have if it can be drawn or extruded into wires and does not...
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22M.2.SL.TZ0.2b:
List two properties that enable rope to maintain its strength.
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22M.2.SL.TZ0.5a:
List two properties that made cast iron a suitable material for the Bailey Wood Plane.
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18M.1.SL.TZ0.14:
The joints along railway tracks have noticeable gaps. This is not a design flaw as these gaps serve a purpose, see Figure 5.
Figure 5: The gaps along railway tracks
[Source: https://commons.wikimedia.org/wiki/File:Track_joint.jpg]
What purpose do the gaps along railway tracks serve?
A. Easy access for maintenance
B. Allow for thermal expansion
C. Ease of transportation
D. To adjust the distance between the wooden sleepers
- 19N.1.SL.TZ0.15: Sunglasses can be made using a smart material that, if deformed, will return to its original...
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19N.1.SL.TZ0.14:
The aircraft canopy of the fighter jet in Figure 4 allows the pilot to see out while flying. It is made from a thick polycarbonate which can absorb the impact of any debris.
Figure 4: An aircraft canopy
[Source: https://pixabay.com]
What mechanical property does this demonstrate?
A. Ductility
B. Hardness
C. Toughness
D. Plasticity
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22M.2.SL.TZ0.1d.i:
State how the plastic straw gains its stiffness.
- 17N.1.SL.TZ0.15: Photochromic materials change in response to what stimulus? A. Heat B. Light C. Electric...
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21N.2.SL.TZ0.7a:
Outline one physical property that makes hardwood a suitable choice for the base of the Gramovox® bluetooth speaker in Figure 13.
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19N.2.SL.TZ0.7b:
Explain one physical property that the material used in the Zuperzozial kitchenware needs to possess.
- 18N.1.SL.TZ0.16: Which best describes the properties required of copper when being drawn into wire? A....
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19M.2.SL.TZ0.7a:
List two properties that are required in the materials used in a smartwatch.
- 18N.1.SL.TZ0.15: A table leg, under normal load conditions, would be under which force? A. Shear B....
- 19M.1.SL.TZ0.17: Which of the following best describes the term brittle? A. Returns to its original shape...
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21N.2.SL.TZ0.1a.i:
Define elasticity.
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21N.2.SL.TZ0.1a.ii:
Figure 4 shows an example of a stress / strain graph.
Describe what happens when the stress on a material causes it to exceed its yield point.
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18N.2.SL.TZ0.1a.ii:
Outline which physical property would have the greatest impact on the fuel consumption of a plane.
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18N.2.SL.TZ0.1b.ii:
Outline why magneto-rheostatic smart materials would be used in the landing gear of the Boeing 787.
