![...competed
over the same food source...
...competed
over the same food source...](https://content2.mcqstudy.com/ss/tbbt-4-18-00:09:34.884.jpeg)
...competed
over the same food SOURCE...
The Big Bang Theory Season 4, Episode 18
![But not so deep as to introduce
a new source of friction. But not so deep as to introduce
a new source of friction.](https://content2.mcqstudy.com/ss/tbbt-2-5-00:13:12.540.jpeg)
But not so deep as to introduce
a new SOURCE of friction."
The Big Bang Theory Season 2, Episode 5
![I know that money can
be a source of friction
I know that money can
be a source of friction](https://content2.mcqstudy.com/ss/tbbt-12-3-00:17:26.828.jpeg)
I know that money can
be a SOURCE of friction
The Big Bang Theory Season 12, Episode 3
![...caused by relative motion between
the source of the wave and the observer.
...caused by relative motion between
the source of the wave and the observer.](https://content2.mcqstudy.com/ss/tbbt-1-6-00:07:33.743.jpeg)
...caused by relative motion between
the SOURCE of the wave and the observer.
The Big Bang Theory Season 1, Episode 6
![Not only do I have a deep-cycle
marine battery power source
Not only do I have a deep-cycle
marine battery power source](https://content2.mcqstudy.com/ss/tbbt-5-15-00:13:42.587.jpeg)
Not only do I have a deep-cycle
marine battery power SOURCE
The Big Bang Theory Season 5, Episode 15