instruction:
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.
question:
Sentence1: friction causes an object to lose energy. 
Sentence2: Friction occurs when surfaces rub together.
answer:
friction


question:
Sentence1: Cancer is a disease in which cells divide out of control. 
Sentence2: Cancer is a disease in which cells grow and divide rapidly.
answer:
Cancer


question:
Sentence1: a speedometer is used for giving a driver feedback on the speed of their vehicle. 
Sentence2: a speedometer measures miles per hour.
answer:

speedometer