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# what does this term mean? (mechanics) watch

1. The term that I have am trouble understanding is 'intractable equation'. Here is the context it is in:

'In many problems in A-level and first year undergraduate dynamics, air resistance is ignored either because it has a negligible effect on the motion or because to include it leads to an intractable equation of motion'.

any help is appreciated , thank you
2. Unsolvable.
3. (Original post by Mr M)
Unsolvable.
thank you
4. (Original post by Mr M)
Unsolvable.
Also, another sentence:

'it is usual to assume that the air resistance is proportional to both the square of the velocity and the cross-sectional area normal to the direction of the motion.'

5. (Original post by Kaya_01)
Also, another sentence:

'it is usual to assume that the air resistance is proportional to both the square of the velocity and the cross-sectional area normal to the direction of the motion.'

It's just a mathematical model that happens to fit real life pretty well.

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