During a lesson on weight comparison, what important concept does Sam demonstrate understanding of?

The correct answer focuses on the understanding that weight can vary despite size. This concept is fundamental in teaching students that two objects can be similar in size but differ significantly in weight due to factors such as material composition. For example, a large piece of wood may weigh much less than a small metal object, illustrating that size alone does not determine weight. This reinforces the notion that weight is influenced by the density and mass of the material rather than just the physical dimensions.

Recognizing this distinction allows for deeper exploration of related concepts such as density and material properties, helping students to develop a comprehensive understanding of physical science principles.