Because natural phenomena are incredibly complex and often happen incredibly quickly. For an example how quickly they happen drop a object off of your desk, it falls on the ground in maybe a second. Developing a mathematical model that explains it took till Issac Newton. For complexity just look at 3Blue1Brown [explain the physics of a ball swinging on a pendulum](https://youtu.be/p_di4Zn4wz4?list=PLZHQObOWTQDNPOjrT6KVlfJuKtYTftqH6&t=350), a simple introductory physics problem. After about 30 seconds he says the components of the equations are deceptive ‘lies’ and that after about 1 minute I at least get really scared by the horrors that is differential calculus.
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