Do you mean into the engine? If so it depends on how little; a quart is too much for a small engine. There wouldn't be any immediate damage but change the oil before running the car again.
In a small amount (a few ounces), probably not. A larger amount may effect water pump seals.
Yes , it does.
Yes, if you drive with the power steering empty of fluid and the motor locks up, it can actually rip the belt from the motor. You can damage belts and the steering motor if you drive with the power steering empty.
It is possible that no damage will occur by accidentally filing a petrol motorcycle with diesel. The motorcycle make emit a lot of smoke as a result of doing this.
No ... However, don't turn the steering wheel (power steering) from one extreme to the other. Don't turn it all the way right or left, if you do it will damage the steering unit. Stop turning when you hear the noise and back off.
If the engine will run you could drive it, but I would advise against it. The diesel may damage the O2 sensors and catalytic converter. Drain the tank and then fill it up with fresh gasoline. No real damage will be done with the small amount of diesel left.
If you put petrol in a diesel vehicle do not start the engine. Petrol will do serious damage to a diesel engine. You must drain all the petrol out and flush the fuel lines.
If your power steering pump is not working as well as it used to.
In most Ford products, Mercon, Mercon V is the recommended power steering fluid
It'll be hard to steer a car. The steering wheel will be tough to steer.