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Summary of basic ideas needed for
As physics
There are six base quantities that you need for
A-level (time, length, mass, temperature, electric
current and amount of substance). All other
quantities are derived from these.
For an equation to be correct it must be
homogenous. This means that all the…

Page 2

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A single vector can be resolved to find its effect in
two perpendicular directions. The component of a
vector in any direction is found by multiplying the
vector by the cosine of the angle between the
vector and the required direction.
Subtracting a vector is the same as adding a…

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