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.

[Q]: Sentence1: If there is no movement friction is zero. 
Sentence2: Movement causes the temperature of an object to increase.
[A]: movement


[Q]: Sentence1: mountains are formed by earthquakes. 
Sentence2: Mountains are formed by moving plates.
[A]: are


[Q]: Sentence1: From the bladder, urine leaves the body. 
Sentence2: The bladder empties through a sphincter in the process of urination.
[A]:
bladder