Which of the following could be considered a mechanical advantage in a gear system?

In a gear system, the ratio of teeth between gears is a key factor that contributes to mechanical advantage. This ratio directly influences how torque and speed are transmitted between the connected gears. When the ratio of the number of teeth on the driving gear (the one providing power) to the driven gear (the one receiving power) is analyzed, it helps determine whether the system will increase torque or increase speed.

For instance, if the driving gear has fewer teeth than the driven gear, the system will increase torque at the expense of speed. Conversely, if the driving gear has more teeth, the opposite effect occurs, resulting in increased speed but reduced torque. Understanding this ratio is critical for designing gear systems to achieve desired performance outcomes, whether that be to maximize efficiency in mechanical power delivery or alter the speed of rotation.

The other considerations, such as the size of gear A, the material used for gears, and the weight of the system, may affect other aspects of gear operation, like durability, stability, or efficiency but do not directly provide a mechanical advantage in terms of torque and speed alteration. Thus, the ratio of teeth is the most relevant factor for assessing mechanical advantage in a gear system.