At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8

Question:

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the left side of the pivot an adult pushes straight down on the teeter-totter with a force of 151 N. In which direction (clockwise or counterclockwise) does the teeter-totter rotate if the adult applies the force at a distance of

(a) 3.0 m,

(b) 2.5 m,