Answer:
Gears work on the principle of mechanical advantage .
Step-by-step explanation:
Gears are usually used for two purposes increasing speed and force. Gears work on the principle of mechanical advantage.
Mechanical advantage of a system is defined as the ratio of output force to the input force.For gears we have special term called gear ratio.
![gear ratio=(final gear's speed)/(initial gear's speed)](https://img.qammunity.org/2020/formulas/physics/middle-school/9rkg9rgc8rdnnqgazie7n7uj1smby3zwg1.png)
As the gears rotate with a angular velocity we say that gears operate with rotation energy. These are usually connected to a big system where electrical energy is converted into mechanical i.e. rotational energy. So the gears form up a connection series called gear train to increase or decrease the speed or any other requirement.