The **first gear** is the one that transmits the most forward force in a vehicle. This is because, at this speed, the engine has **a lot of power** even though the vehicle moves at a **low speed**.

- When starting off, it is recommended to begin in first gear because the engine needs more force to set the vehicle in motion from a standstill.
- As you shift to higher gears, such as second, third, fourth, and fifth, the power decreases and the speed increases. This means that higher gears are more efficient for maintaining speed, but not for generating the initial force needed to start the vehicle.

Therefore, the first gear is essential to provide the necessary force to initiate the vehicle's movement.