Foundations of physics

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    Created by
    Jack H

    Cards (12)

    • The 6 SI base units are:
      • length - metre
      • mass - kilogram
      • time - second
      • current - ampere
      • temperature - kelvin
      • amount of substance - mole
    • Prefixes change the order of magnitude of a quantity. Some examples of prefixes are:
      • P - 101510^{15}
      • T -101210^{12}
      • G -10910^{9}
      • M -10610^{6}
      • K - 10310^{3}
      • d - 10−110^{-1}
      • c - 10−210^{-2}
      • m -10−310^{-3}
      • μ\mu - 10−610^{-6}
      • n - 10−910^{-9}
      • p - 10−1210^{-12}
      • f - 10−1510^{-15}
    • Units for a quantity can be derived using equations and other units.
    • A scalar quantity has magnitude only, while a vector quantity has both direction and magnitude.
    • Quantities can only be summed when they have the same units, but they can be multiplied when they have different units.
    • A vector is represented with an arrow.
    • If two vectors are parallel, the resultant vector is their sum.
    • When two vectors act on the same plane but in opposite directions, the resultant vector is their sum, provided a negative direction is defined.
    • The resultant vector from two perpendicular vectors can be found using Pythagoras’ theorem and trigonometry. Draw the vectors in a triangle, with one vector leading to the next.
    • A vector can be resolved into its horizontal and vertical components using trigonometry.
    • When adding non-perpendicular vectors, you can use a scale diagram or trigonometric rules.
    • To subtract one vector from another, reverse the direction of the vector and add the vectors together.
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