The cam rotates at 5 rpm. How many times will the follower (needle) move up and down in a minute?

To determine how many times the follower (needle) moves up and down in one minute when the cam rotates at 5 rpm, it's essential to understand the relationship between the rotation of the cam and the movement of the follower.

In this case, if we know that for every complete rotation of the cam, the follower moves in a specific motion pattern, we can easily multiply the number of rotations by the movement the follower makes per rotation.

If the cam rotates 5 times in one minute, and if the setup allows the follower to move up and down with each rotation of the cam, then the follower would move up and down two times per rotation (once up and once down). Therefore, for 5 rotations, the follower would complete 5 rotations multiplied by 2 movements per rotation, resulting in 10 movements (5 x 2 = 10).

Thus, the follower (needle) will move up and down a total of 10 times in one minute. This understanding aligns with the mechanics of cam and follower systems in basic mechanical engineering principles, emphasizing how rotational motion translates to linear movement.