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1.
YouaretodeterminetheYoungmodulusofthematerialfromwhichthemetreruleismade.
(a) Measure as precisely as possible the width band the
thickness dof the metre rule.
Estimate the percentage uncertainty in each of these
quantities.
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(b) Set up the apparatus as shown in the diagram below. Clamp
the rule to the bench at the
5.0 cm mark, using the small block of wood to give a
well-defined edge. Use the rubberbands to attach a total mass
ofM=0.200 kg to the metre rule at the 95.0 cm mark. This
is best done by placing a 100 g slotted mass on either side of
the rule.
l
Wooden blockG-clamp
Metre rule
Two 100 gslotted masses
95.0 cm
Bench
Measure the horizontal distance lfrom the edge of the bench to
the vertical line through
the 95 cm mark on the rule. Estimate the percentage uncertainty
in its value. Explain
how you ensured that this value was determined as precisely as
possible. You may add tothe diagram if you wish.
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Khalid Mazhar Qureshi www.edexcel-cie.com
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(c) Displace the end of the metre rule vertically and determine
the period Tof small verticaloscillations of the mass. Estimate the
percentage uncertainty in your value of T.
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Explain how you ensured that Twas determined as precisely as
possible.
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(d) The Young modulus Eof the material of the rule is given
by
E=23
3216
Tbd
Ml
Calculate a value for E. Discuss which of your measurements
contributes most to the
uncertainty in its value.
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(Total20marks)
Khalid Mazhar Qureshi www.edexcel-cie.com
