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Edexcel | Physics WPH0 | S 11 6 1 | 1 hour 30 minutes

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1

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A student wishes to find the density of a metre rule.

The width of the rule is about 28 mm and the thickness is about 6 mm.

1

(a)

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2 Mark s

In the table below write the names of the instruments you would use to make each of

these measurements.

Give a reason for your choices.

• Both correct

Reason:

To obtain both measurements to 3 SF

1

(b)

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3 Mark s

The student records measurements from several positions along the rule.

Use these measurements to calculate a value for the density of the rule.

Density =

• Mean values for both width and thickness seen

• Correct substitution into density equation

• Correct value of density to 3 or 4 SF and unit

Example of calculation

1

(c)

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3 Mark s

Estimate the percentage uncertainty in your value for the density. Assume the

uncertainty in the mass is negligible.

Percentage uncertainty for the density =

• Uncertainty in t or w correct

• Both % uncertainties calculated correctly (allow ecf)

• % U added to combine

Eg Width ± 0.55 mm (accept ± 1.1 mm), %U = 0.55/28.9 = 1.9%

Thickness ± 0.05 mm (accept ± 0.1 mm), %U = 0.05/5.99 = 0.83%

% uncertainties added - expect 2.7% or 5.4%

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