A large cardboard box packed with packing peanuts is placed on one side of a balance scale. A small solid metal block is placed on the other side. The metal side sinks lower. What does this show?
AThe box is lighter because it is bigger and has more space inside
BThe metal block is heavier than the box, even though it is smaller
CThe box is heavier because it contains more individual packing peanuts
DYou cannot compare them without knowing their weight in pounds or grams
The balance scale shows that the metal block exerts more downward force — it is heavier — regardless of its size. Size and weight are independent: a large, mostly empty object can be lighter than a small, dense one. The balance scale makes this comparison directly visible without any numbers, which is exactly the point of this stage of measurement.
Question 2 Multiple Choice
Your teacher says 'this book is heavy.' A classmate says 'that statement is incomplete.' Who is right, and why?
AThe teacher is right — heavy describes an absolute property of the book
BThe classmate is right — 'heavy' only makes sense as a comparison to something else
CBoth are right — heavy and light are the same as numbers on a scale
DNeither is right — only balance scales can describe weight
'Heavier' and 'lighter' describe relationships between two objects, not fixed properties of one object. A book is heavy compared to a pencil but light compared to a chair. Weight comparisons require two objects: one being compared to another. This relational nature of comparison language is the core concept at this stage, before standard units are introduced.
Question 3 True / False
A balance scale can tell you which of two objects is heavier without using any numbers.
TTrue
FFalse
Answer: True
This is the key function of a balance scale: the heavier side sinks and the lighter side rises, giving a visual comparison with no numbers needed. This is why the balance scale is introduced before standard units — it teaches the concept of comparison (heavier, lighter, about the same) as a direct, observable relationship.
Question 4 True / False
A larger object is typically heavier than a smaller object.
TTrue
FFalse
Answer: False
Size and weight are independent properties. A large balloon is lighter than a small rock. A big cardboard box full of air is lighter than a small block of iron. The common misconception is that bigger means heavier, but what matters is the material and how tightly packed the mass is. This is why we need to actually compare objects (by holding them or using a balance scale) rather than just looking at size.
Question 5 Short Answer
Why can't you describe an object as simply 'heavy' without comparing it to something else?
Think about your answer, then reveal below.
Model answer: 'Heavy' is a relational word — it only has meaning in comparison to something else. A backpack is heavy compared to a pencil but light compared to a car. Without a reference object, 'heavy' tells you nothing useful. This is why we say 'heavier than' or 'lighter than' — weight at this stage is always a comparison between two specific objects.
This relational understanding is foundational to measurement. Before students can work with standard units (pounds, grams), they need to understand that measurement is always a comparison — either to another object or to a standard unit. The language of 'heavier' and 'lighter' builds the conceptual framework that standard units later make more precise.