Summer 2026 Predicted
worked solutions
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, Answer ALL questions in the spaces provided.
1. A student uses the electromagnet method to determine the acceleration due to
gravity, g.
The figure shows the apparatus used to measure the acceleration due to gravity, g,
using the electromagnet method.
(a) Explain why the timer starts at the same moment the electromagnet is switched off.
(2)
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,(b) The student records the following data:
h (m) t₁ (s) t₂ (s) t₃ (s) t mean (s) t²mean (s²)
0.20 0.202 0.198 0.201 0.200
0.40 0.285 0.289 0.283 0.286
0.60 0.350 0.348 0.355 0.351
0.80 0.404 0.401 0.408 0.404
1.00 0.452 0.448 0.455 0.452
Complete the t² mean column.
(1)
(c) The gradient of the t² against h graph is found to be 0.204 s²m⁻¹. Calculate g and find
the percentage error compared to the accepted value of 9.81 ms⁻².
(3)
g= ………………...…………… m/s2
Percentage error = ………………...…………… %
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, (d) The student suggests that residual magnetism in the ball causes a systematic error.
Explain how this affects the results, how it would appear on the graph, and suggest
how it can be reduced.
(3)
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(e)* A student claims that air resistance is a significant source of error in this experiment.
Evaluate this claim, referring to the speed of the ball during the experiment.
(6)
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for more: tyrionpapers.com
worked solutions
for more: tyrionpapers.com
, Answer ALL questions in the spaces provided.
1. A student uses the electromagnet method to determine the acceleration due to
gravity, g.
The figure shows the apparatus used to measure the acceleration due to gravity, g,
using the electromagnet method.
(a) Explain why the timer starts at the same moment the electromagnet is switched off.
(2)
………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………
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………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………
for more: tyrionpapers.com
,(b) The student records the following data:
h (m) t₁ (s) t₂ (s) t₃ (s) t mean (s) t²mean (s²)
0.20 0.202 0.198 0.201 0.200
0.40 0.285 0.289 0.283 0.286
0.60 0.350 0.348 0.355 0.351
0.80 0.404 0.401 0.408 0.404
1.00 0.452 0.448 0.455 0.452
Complete the t² mean column.
(1)
(c) The gradient of the t² against h graph is found to be 0.204 s²m⁻¹. Calculate g and find
the percentage error compared to the accepted value of 9.81 ms⁻².
(3)
g= ………………...…………… m/s2
Percentage error = ………………...…………… %
for more: tyrionpapers.com
, (d) The student suggests that residual magnetism in the ball causes a systematic error.
Explain how this affects the results, how it would appear on the graph, and suggest
how it can be reduced.
(3)
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………………………………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………………………………
(e)* A student claims that air resistance is a significant source of error in this experiment.
Evaluate this claim, referring to the speed of the ball during the experiment.
(6)
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