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    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
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    Unsolvable.
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    (Original post by Mr M)
    Unsolvable.
    thank you
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    (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.'

    Why is this assumption made?
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    (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.'

    Why is this assumption made?
    It's just a mathematical model that happens to fit real life pretty well.
 
 
 
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