How do car transmissions work?
How do car transmissions work?
user
Did you mean to type “Cars” instead of “Car”? 
You can think of it like this:
assistant
How do different gears work inside of the car's transmission?
user
Each gear moves a piston that pushes against the engine, and uses the energy of that push to rotate the wheels and cause the car to move.
assistant
Why do some transmissions have more gears than others?
user
Some transmissions have higher numbers of gears, and some don't.  More gears are helpful for more complicated situations.  For example, imagine you were trying to drive up a steep hill.  If your car only had three gears, then when you tried to move up the hill you would have to accelerate the engine slowly, which uses a lot of fuel, and causes the car to shake.  If your car had five gears, you could choose a gear that is low enough to just get you started, then shift into a higher gear that you could stay in for a while until you were at the top of the hill.
assistant
What is the maximum numbers of gears a transmission can have?
user