What are the differences between first, second, third, and fourth gears in a car?

[StSamantha]

Here are the differences between first, second, third, and fourth gears in a car: 1. Different speed ranges: First gear is used for starting, with speeds under 20 km/h; second gear is used between 20-40 km/h; third gear can be used between 40-60 km/h. 2. Different functions: When starting in first gear, it's best to accelerate slowly. First gear is generally used only when starting or turning. Third gear at 2500-3500 RPM provides suitable engine torque for overtaking or climbing steep hills, but fuel consumption and noise increase. Second gear at 2000-2500 RPM is more fuel-efficient (varies slightly depending on the engine), with moderate torque and relatively low noise, making it suitable for normal driving. 3. Different driving conditions: First gear is the starting gear, used when the car begins moving. Its gear ratio is similar to reverse gear, so it's not suitable for sustained high-speed operation. Generally, you can shift to second gear once the car gains momentum. Second gear is the passing gear, mainly used for navigating complex road surfaces or handling difficult situations. Third gear is the transition gear, primarily used for low-speed urban driving - it allows easy transition to fourth gear when accelerating or downshifting to second gear when decelerating.