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Question 19M.1B.SL.TZ1.1a.i

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Date May 2019 Marks available [Maximum mark: 3] Reference code 19M.1B.SL.TZ1.1a.i
Level SL Paper 1B Time zone TZ1
Command term Calculate Question number a.i Adapted from N/A
a.i.
[Maximum mark: 3]
19M.1B.SL.TZ1.1a.i
(a.i)

Calculate the percentage error in the measured value of g.

[3]

Markscheme

error in m1 + m2 is 1 % OR error in m1 − m2 is 40 % OR error in a is 1 % ✔

adds percentage errors ✔

so error in g is 42 % OR 40 % OR 41.8 % ✔

Allow answer 0.42 or 0.4 or 0.418.

Award [0] for comparing the average value with a known value, e.g. 9.81 m s-2.

Examiners report

Atwoods machine a) is a quite straightforward question that tests the ability to propagate uncertainties through calculations. Almost all candidates proved the ability to add percentages or relative calculations, however, many weaker candidates failed in the percentage uncertainty when subtracting the two masses.

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