# summary of basic ideas for As physics

a summary of the basic ideas needed for the As physics sylabus

- Created by: Olivia Blanchet
- Created on: 03-04-10 15:35

First 166 words of the document:

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 terms have

the same units. But remember, a homogenous

equation may not be entirely right.

You should always give your numerical answers to

the correct number of significant figures.

Scalars have size (magnitude) only

Vectors have size (magnitude) and direction. Vectors

are represented by arrows.

When vectors are added together to find the

resultant, we must take account of their direction.

For vectors acting along the same straight line we

take one direction as positive and the other as

negative.

To add two perpendicular vectors you can use

pythagoras' theorem a2 + b2 = c2

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