Post the year, make and model of the vehicle (in new question) and one of us can tell you if it is negative or positive ground.
You will damage the electrical system of the car
On the car battery, the positive wire is red and the negative wire is black. If the body of the car is metal or conducts electricity, then the body of the car serves as the negative wire. The metal in the engine serves as the negative wire.
If you have a post battery(the cable attaches from the top) the positive post is larger than the negative.
No, it is not possible to jump-start a car battery with a positive-negative connection. Jump-starting a car requires connecting the positive terminals of both batteries and the negative terminals of both batteries. Connecting positive to negative directly can cause damage to the electrical system.
Find the cable that is connected directly to the frame or sub-frame of the car. If it is red, then Positive is ground; If it is black, then Negative is ground. More than likely (but not in all cases) the electrical system is Negative ground.
You conect them in parelell. Positive to positive, negative to negative, with either a 12 or 6 volt system. if you conect them in series you will double the voltage.
NO! positive is red and black is negative negative is grounded to the frame of the car, and positive goes to the electrical components.
If you want to jump start your car, connecting negative to negative and positive to positive is the only way to do it. Connecting negative to positive will result in extensive damages to the electric systems of both cars.
The car is slowing down
It is almost always imprinted on the battery next to the posts. If not the positive + post is slightly larger than the negative - post.
The center is the positive.
The torque generated by the engine in this car is positive.