What is the primary function of gears in mechanical systems?

The primary function of gears in mechanical systems is to transmit torque and adjust speed, making the choice of B the correct answer. Gears play a crucial role in converting the rotational motion and force generated by one component of a system (like a motor) into a desired speed and torque output for another component (such as wheels in a vehicle).

When gears are engaged, their teeth interlock, allowing one gear to turn another, which can either increase speed or amplify force depending on the size ratio between the gears. For example, a smaller gear turning a larger gear will slow down the speed but increase the torque output, which is valuable in applications requiring high power at lower speeds, such as in heavy machinery or vehicles. Conversely, a larger gear driving a smaller gear can produce a higher speed with reduced torque, which is common in applications like bicycles.

Other functions mentioned do not accurately represent the primary role of gears. Storing energy, maintaining temperature, or filtering noise are not functions that gears are designed to perform in the context of mechanical systems. Their design and function are primarily related to the mechanical advantage they provide through torque and speed adjustments.