OK, I am going to try. But do not expect it to be an exhaustive analysis. I can't even guarantee it will be a correct analysis. This is just something to give you a jump start.
The five major forces that influence Ford's business environment are:
1) Buyers. Buyers demand better cars (safer, aestetically appealing, with more features, etc. [insert your own requirements of a car]). At the same time they do not want to spend money. They also have a choice of buing Japanese, European, GM or Chrysler. They also want good financing deals. Problem: how do you satisfy all the requirements when there is a limited ability (if any at all) to increase prices.
2) Suppliers. Modern cars contain thousands of parts from plastic caps to screws to microprocessors. Suppliers try to get top dollar for their products. Suppliers that offer high quality and unique products cannot be replaced by cheaper Chinese or Mexican (for example) suppliers since those do not manufacture the same kind of parts. Sometimes suppliers become controlled by competitors who can attempt to drive prices up and/or can create parts shortage. Also, there is always a danger of getting low quality parts (Firestone tires, for example). Problem: So, suppliers try to raise prices. Therefore, Ford needs to raise prices on cars. Consumers do not want to pay extra. See 1) above.
3) Potential entrants. There is always a danger of new competitors entering the market. Huyndai, Kia, Daewoo are examples. Problem: Consumer get more choices, car prices are pressured down. Suppliers have new customers, so they get into a better negotiating position.
4) Substitutes. Public transportation, bicycles, scooters, electric cars are examples of substitutes. Problem: Based on different political and economical conditions, these can provide a viable alternative to cars.
5) Industry competitors. Japanese, European manufacturers and GM offer competing products, often at better prices, better looking, with more features. There is always a possibility of price wars. Some manufacturers compete on prices, so again you have pricing pressure. Some have outright better cars at comparable prices. etc. etc. etc.
How is this for a jump start? If you decide to use it in your paper, make sure you make a reference.