Poper argued that "fittest" traits are derived from the definition "traits of those Who survived" which is a tautological statements this evolutionary theory, of which this is the main idea, is also tautological. However, the theory has a mechanism i. E mutations that explain it so the argument weakens.
I Newtons 2nd law, force is defined the same way by occurances of acceleration which again traits of force entities are derived from the definition of "(force as a trait of those entities in the vicinity of objects that are excibiting acceleration). However, No mechanism is identified so the tautological argument is not weakened.