Theory:

A phrase is a combination of two or more words. A phrase which contains "a verb + a preposition/adverb", and forms a meaning which is different when the words are read separately, is called a phrasal verb.
Example:
1. Break is a verb. It means to separate into pieces.
 
When prepositions (in, with, down) are added to it, the meaning changes.
  
Verb
+
Preposition
=
Phrasal
Verb
Meaning
BreakinBreak inForcibly enter.
BreakwithBreak withQuarrel with.
BreakdownBreak down
Stop functioning.
  
2. Turn is a verb. It means to move around a fixed point.
 
When prepositions (in, up, down) are added to it, the meaning changes.
 
Verb +
Preposition =
Phrasal Verb
Meaning
TurninTurn inTake someone to police, hand over.
TurnupTurn upArrive unexpectedly.
TurndownTurn downReject or refuse.
Phrasal verbs used in the lesson "Sir Isaac NewtonAn Ingenious Scientist":
 
Phrasal
 Verbs
Sentence
Meaning
Set up "In due time, Isaac would set up for himself, and would manufacture curious clocks."The way in which something, is organized or arranged.
Searching out"He was continually searching out the secrets of philosophy."To find something by careful examination/observation.
Move about"But then it would not have been able to move about."To move from place to place.
Looked up"He looked up with reverential curiosity at the stars."See with respect and admiration.
Look out"I must look out for one".Be vigilant and take notice.
Guided through

"He had searched out all the laws, by which the planets were guided through the sky".

To show the way/direct something/somebody.
Come into

"All the other famous inventions that have come into use since his day".

Begin to be practised.