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1 markPhysical Quantities

CAPE Physics Unit 1 · 1999 · Paper 2 · Question 5(b)(iv)

The viscosity of oil determined by this method is 0.010 N s m⁻².

Identify ONE case of random error and one case of systematic error in the measurements of the physical quantities required to determine η. Say what you would do to reduce these errors.

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Other parts of this question

  1. 5(a)(i)Three important 'base quantities' are mass, length and time. Explain the term 'base quantity' and give another example of a 'base quantity'.[7 marks]
  2. 5(a)(ii)If in another system of units the base quantities and units are mass/kg, length/m, and force/N, what would be the unit of time?[1 mark]
  3. 5(a)(iii)How would you use base quantities or units to check the homogeneity of physical equations? State ONE way in which an equation that is homogeneous may,…[1 mark]
  4. 5(b)(i)Assuming the given equation to be homogeneous, show that the SI unit of η is N s m⁻².[13 marks]
  5. 5(b)(ii)Estimate the uncertainty to which η can be determined.[1 mark]
  6. 5(b)(iii)What is the actual uncertainty in the measurement?[1 mark]

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