Explain the type of gear to be used to convert the rotatory motion into linear motion.

The rack and pinion mechanism is used to convert rotatory motion into linear motion. In this system, the pinion is a circular gear that engages with a flat, toothed component known as the rack. When the pinion rotates, its teeth mesh with those of the rack, causing the rack to move in a linear direction. This mechanism is commonly used where precise linear motion is required in robotic systems and machinery.