Edexcel A Level Physics

Revision Notes

1.3 Estimating Physical Quantities

Test Yourself

Estimate Physical Quantities

  • There are important physical quantities to learn in physics
  • They are particularly useful when making estimates
  • A few examples of useful quantities to memorise are given in the table below (this is by no means an exhaustive list)

Estimating Physical Quantities Table

Estimating Physical Quantities-Table, downloadable AS & A Level Physics revision notes

Worked example

Estimate the energy required for an adult man to walk up a flight of stairs.

Estimating Physical Quantities, downloadable AS & A Level Physics revision notes

Exam Tip

The mark scheme for calculations involving estimates are normally quite generous and offer a range of values as the final answer. Some common estimates are:

  • Mass of an adult = 70 kg
  • Gravitational field strength, g = 10 m s-2
  • Mass of a car = 1500 kg
  • Wavelength of visible light = 400 nm (violet) – 700 nm (red)

Many values are already given in your data booklet that therefore may not be given in the question, so make sure to check there too! 

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