TP - Primo - Study of a gearbox

Extract B.O.:
Transport
Experimentally determine the efficiency of an electric motor. Exploit the mechanical characteristic of an electric motor and determine an operating point.
From the torque-speed curve of a motor, calculate the power it provides for a given operating point using the relationship P = 2 x pi x nM.

Introduction:
Why is it necessary to change gears when the car accelerates?
Why is it difficult to start a car in second gear?
The gearbox is a mechanical device that allows for adapting the transmission of a vehicle to facilitate its acceleration and movement based on the characteristics of the route taken.