Hashkiveinu
Question
Hashkiveinu Prayer at Maariv ends differently on weekday night
versus Friday night.
Weekday
Baruch ata Adonai Shomeir Amo Yisrael La-ad
Baruch ata Adonai eternal guardian of Your people Israel.
Friday night
Ufros aleinu sukkat shelomecha
Baruch ata Adonai ... v'al kol amo yisrael v'al yerushalayim
May You spread over us your canopy of peace
Baruch ata Adonai ... over all the people Israel, and over Jerusalem.
Please explain the differences and the reason that the prayer is different.