velocity ratio

The velocity ratio is a physics concept that describes the ratio of distances moved by different parts of a machine. Specifically, it's the ratio of the distance a driven part of a machine moves to the distance the driving part moves in the same amount of time. This ratio is crucial for understanding how machines modify motion. For example, in a wheel and axle system, the velocity ratio is determined by the radii of the wheels or gears involved. It's important to note that while the velocity ratio itself is not affected by friction, the actual mechanical advantage (the ratio of output force to input force) is always less than the velocity ratio due to energy losses from friction.123