Final answer:
Aristotle's objections included the problem of immaterial forms affecting material things and the difficulty of defining wide-ranging concepts like 'the good' as a single Platonic form.
Step-by-step explanation:
One of Aristotle's objections to the Platonic form of the Good is the issue of how an immaterial form, which lacks matter, could cause change to material entities. Aristotle also challenged the idea that concepts not easily reducible to a simple meaning, like 'the good', could be represented by a single form. He advocated for the study of specifics or particulars to truly understand the essence of something. Unlike Plato's theory, which emphasizes otherworldly forms, Aristotle's approach explained substances through a composite of matter and form, analyzing the purpose or 'whatness' informing each particular instance through natural observation and categorization into species and genera.