Definition: Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.
Input: Sentence1: If an object is at equilibrium, then the forces are balanced. 
Sentence2: Two forces at an equilibrium on an object in opposite directions will keep the object stationary.

forces