The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

angular MOMENTUM, potential energy
and kinetic energy.
The Big Bang Theory Season 10, Episode 16

They have all
the MOMENTUM right now.
The Big Bang Theory Season 12, Episode 21