Physics by Aristotle

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To know a thing involves understasting first principles.

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Matter is potentially,form is actually ;

to each form there corresponds a special matter.

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There are four types of causes :

1.the material cause -matter- ;

2.the formal cause -the kind- ;

3.the final cause -the purpose- ; and

4.the efficient cause -that which initiates change- ;

in addition,

5.change and

6.spontaneity

are kinds of causes.

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Nature,defined as a principle of motion and change,

is a cause that operates for a purpose.

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The infinite is potential,never actual.

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Place is the innermost motionless boundary of what contains ;

Time is the number of motion in respect to before and after.

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There are three kinds of change :

1.qualitative,

2.quantitative,and

3.local.

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There must be an UNMOVED MOVER which by eternal rotary motion imparts motion to all things.

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