The 8 hour workday started in San Francisco when PH McCarthy led about 8000 workers from the Building Trades Council and formed the planning mill union in 1900. They went on strike and won, thus creating an 8 hour workday for them. The in 1912 Teddy Roosevelt campaigned for an 8 hour day in the presidential election and THEN Ford implemented it 2 years later. A German company many years prior to this actually started the 8 hour day.
As far as a 5 day work week, that was done by a New England cotton mill in 1908 to allow Jewish workers to observe the Sabbath from sundown Friday till sundown Saturday. Ford shut down his factories on Saturday and Sunday about 18 years later.
Ford raised the wage from $2.38 to $5.00, to decrease his turnover rate at his company. This was a great move obviously because it increased morale and worker production. Some pundits say he also wanted to create a bigger middle class so he would sell more cars. Obviously this worked.