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Estimating Physical Quantities (Edexcel A Level Physics): Revision Note

Exam code: 9PH0

Katie M

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Katie M

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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.

Answer:

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

Examiner Tips and Tricks

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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    Katie M

    Author: Katie M

    Expertise: Physics Content Creator

    Katie has always been passionate about the sciences, and completed a degree in Astrophysics at Sheffield University. She decided that she wanted to inspire other young people, so moved to Bristol to complete a PGCE in Secondary Science. She particularly loves creating fun and absorbing materials to help students achieve their exam potential.