The noun "physics" is an uncountable (mass) noun that is treated as a singular.
There are two accepted forms that show possession for singular nouns ending in s:
Add an apostrophe (') after the existing s at the end of the word:
Examples:
When I reviewed the course, I was surprised by physics' diversities.
When I reviewed the course, I was surprised by physics's diversities.
The plural possessive form of "mass" is "masses'".
The plural form of the noun light is lights.The plural possessive form is lights'.
The possessive form for the plural noun glasses is glasses'.Example: Her glasses' frame broke when she dropped them.
The plural form of the word "physics" is still "physics" as it is already a plural noun.
The singular possessive form for the noun clock is clock's.
The possessive form of "he" is "his": He did his homework after dinner.
No, it is singular, the possessive form of it is its. The plural form of it is they or them, and the possessive form is their.To answer the question directly: there is no such word as ITS'.
The possessive form is lawyer's.
The possessive form is posse's.
The possessive form is whistle's.
The plural possessive form is Luis's.
The singular possessive form of the noun "it" is "its". Note that there is no apostrophe in the possessive form of "it". The apostrophe is only used after "it" when used as a contraction of "it is".
The singular possessive form is heart's; the plural possessive form is hearts'.
The possessive form for the noun freedom is freedom's.
The possessive form is my sister's friend.
The possessive form for the noun science is science's.
The possessive form is subsidiary's.