Page 636 - SUBSEC October 2017_Neat

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Answer ALL questions.

Write your answers in the spaces provided in this booklet.

1. The data in Table 1 were collected in a terminal velocity experiment. Small metal spheres were
timed over a distance of 80.0 cm as they fell at constant velocity in thick engine oil.

TABLE 1. DATA FROM TERMINAL VELOCITY EXPERIMENT

Radius r/mm Time/s Velocity v/cm s –1 lg (v/cm s ) lg (r/mm)
–1
1.00 44.8
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1.49 20.1
2.02 11.3
2.51 7.2
2.99 5.0

(a) Explain the term ‘terminal velocity’.

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[1 mark]

(b) Draw a force diagram to explain why the velocity is constant.

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[2 marks]

(c) Complete Table 1 by inserting the missing values in Columns 3, 4 and 5.
[3 marks]

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