Final answer:
The force experienced by both the child and the parent on an ice rink is the same in magnitude, according to Newton's third law of motion.
Step-by-step explanation:
The force experienced by the child compared to the force experienced by the parent during their interaction on an ice rink can be understood through Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. This means that the force exerted by the parent on the child is equal in magnitude but opposite in direction to the force exerted by the child on the parent. Thus, despite the difference in their masses, 71 kg for the parent and 19 kg for the child, the magnitude of the force experienced by both parent and child is the same. However, the acceleration each experiences due to this force will differ because of their different masses, as described by Newton's second law (F = ma).