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7 marksSI Units

CAPE Physics Unit 1 · 1999 · Paper 2 · Question 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'.

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Other parts of this question

  1. 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]
  2. 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]
  3. 5(b)(i)Assuming the given equation to be homogeneous, show that the SI unit of η is N s m⁻².[13 marks]
  4. 5(b)(ii)Estimate the uncertainty to which η can be determined.[1 mark]
  5. 5(b)(iii)What is the actual uncertainty in the measurement?[1 mark]
  6. 5(b)(iv)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…[1 mark]

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