Use a Balance Model to Compare Weight

Supplied materials

• Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
• Supplied worked-case record: A model balance has a large sponge on the left and a small stone on the right.
• All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

In the supplied balance model, the heavier side moves down. This tells you about weight, not about which object looks bigger. A light large object can weigh less than a small heavy object. Use only the stated balance observation.

Read which side of the pretend balance is lower. Identify the object on that side as heavier. If the model is level, say the weights are equal in this model instead of choosing by appearance.

Use the supplied lower-side rule. Weight cannot be concluded from drawn size alone. Sketch a balance beam and label the stated lower side.

1. Sketch a balance beam and label the stated lower side.
2. Follow the worked example. Point to each number or shape feature and say what it tells you.
3. Read which side of the pretend balance is lower.
4. Try the question and then the three practice questions. Check your answers and explain any change you make.

Check your reasoning

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Take it further

Describe a level balance holding two different objects. Expected: equal weights in the model, not necessarily equal sizes.

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