A cam produces what kind of motion when combined with a cam follower?

A cam, when combined with a cam follower, produces a reciprocating motion. The fundamental operation of a cam involves converting rotary motion into linear motion. The cam is typically a rotating component with a specific profile or shape, and as it rotates, these profiles push against the cam follower. The motion follows the contour of the cam, resulting in the follower moving back and forth in a straight line, which is the essence of reciprocating motion.

This transformation is widely utilized in various machinery where precise linear movement is necessary. For example, in automotive engines, cams play a pivotal role in operating the engine valves, engaging and disengaging them at the appropriate times as the cam rotates.

Other types of motion listed in the options, such as linear, rotational, and circular, do not accurately describe the unique action facilitated by the cam and follower setup. While the cam itself rotates (creating rotational motion), the resultant action on the follower is what leads to the characteristic reciprocating motion.