MYP Physics · 03 · extended response
Grip, rolling resistance, and a wheelchair tyre
Forces · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- discriminating
- Marks
- 8
- Topics
- 3
- Answer
- Complete
A school is choosing wheelchair tyres. Tyre P needs an average push of 18 N on a smooth floor and 31 N on carpet; it stops in 1.8 m on a wet ramp. Tyre Q needs 23 N on the floor and 38 N on carpet; it stops in 1.2 m on the same wet ramp. Both meet the load rating.
- a
Interpret Explain what the push-force and stopping-distance evidence suggests about the two tyres.
3 marks - b
Recommend Recommend a tyre for a route that includes carpet and a short wet ramp. Justify the choice using physics and user needs.
3 marks - c
Propose Propose one further test needed before a final purchasing decision and explain why it matters.
2 marks
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a
Interpret Explain what the push-force and stopping-distance evidence suggests about the two tyres.
Build a chain of claim, evidence and physics reasoning. Address more than one relevant factor, identify a limitation or assumption, and finish with a conclusion that is conditional on the evidence rather than absolute.
- 1
Explains that P has lower rolling resistance because it requires less force on both surfaces.
- 2
Explains that Q provides greater wet-ramp grip because its stopping distance is shorter.
- 3
Recognises that the evidence shows a trade-off rather than one tyre being best in every respect.
b
Recommend Recommend a tyre for a route that includes carpet and a short wet ramp. Justify the choice using physics and user needs.
Build a chain of claim, evidence and physics reasoning. Address more than one relevant factor, identify a limitation or assumption, and finish with a conclusion that is conditional on the evidence rather than absolute.
- 1
Makes a clear recommendation that is consistent with a stated priority.
- 2
Uses at least two relevant numerical comparisons from the evidence.
- 3
Balances effort or fatigue against control and stopping safety for the user.
c
Propose Propose one further test needed before a final purchasing decision and explain why it matters.
Build a chain of claim, evidence and physics reasoning. Address more than one relevant factor, identify a limitation or assumption, and finish with a conclusion that is conditional on the evidence rather than absolute.
- 1
Proposes a relevant controlled test such as durability, side-slope grip, different user loads, or repeated wet braking.
- 2
Connects the test to a limitation in the current evidence or a real user requirement.
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