"Its", without an apostrophe, is the possessive of the pronoun "it". It is used to describe something that is connected to an animal or inanimate object.
E.g.
The dog is chasing its tail.
"It’s", with an apostrophe, is a contraction of "it is" or "it has".
E.g.
It's (it is) a sunny day.
It's (it has) been a nice day.
Tip
The easiest way I teach my children which is which is I get them to not contract the phrase "it is". If there's a need to, then contract from there.
It's less confusing to use its un-contracted form. :D
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)