Cambridge International AS & A Level · P3 · structured
Make a quantitative verdict
AS practical 8: decide whether two constants agree · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 5
- Topics
- 4
- Answer
- Complete
Constructed measurements give k1=24.0 N m^-1 and k2=26.0 N m^-1. Use the mean as the percentage-difference denominator and compare with a supplied 6% tolerance. Give a qualified conclusion and one reason that a passing two-setting test would not prove a law universally.
- (a)
Calculate percentage difference.
2 marks - (b)
Compare and conclude.
2 marks - (c)
State a limit of a two-setting test.
1 mark
Ready to self-mark?Reveal the detailed answer guide
(a)
Calculate percentage difference.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
8.0%.
(b)
Compare and conclude.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
8.0% exceeds 6%; not consistent with one k within the supplied tolerance.
(c)
State a limit of a two-setting test.
Identify what the question is testing, organise the response into distinct mark-earning points, and make every conclusion traceable to a physical principle or to the evidence supplied.
- 1
A small range/few readings/shared bias means agreement is not universal proof.
Complete marking guidance
Use these worked steps alongside the part-by-part answers. They explain the method and mark allocation; they do not add extra marks.
- Mean=25.0 N m^-1: one mark.
- 100 x 2.0/25.0=8.0%: one mark.
- Explicitly compare 8.0% >6%: one mark.
- Conclude not supported within this tolerance, without declaring the law universally false: one mark.
- Limited range, too few points or a shared bias: one mark.
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