Weighing In
Scientific inquiry begins with curiosity and develops through structured exploration. When children make predictions, test them, and compare results, they engage in the foundational process of scientific reasoning. Weight and mass concepts are abstract but become concrete through hands-on manipulation of familiar objects.
- Framework: EYFS
- Unit: EYFS Piece of Cake
- Learning area: Science and Investigation
- Level: EYFS 3-4, Reception
Objectives
- Investigate by weighing objects using a simple scale
- Predict, observe, and discuss findings
- Understand that objects have different weights
Materials
- Simple balance scales
- Small toys of various weights
- Same-size rocks or pebbles for standard unit
- Kitchen ingredients (sugar, flour, rice) in small containers
- Recording sheets with pictures for predictions
Instructions
Set up investigation stations with balance scales and a variety of objects to weigh. Prepare recording sheets with pictures of objects and spaces for children to mark their predictions.
Gather children and introduce the balance scale. Demonstrate its function by placing objects on either side and observing how the heavier side tips down. Use clear language: "The side with the heavier object goes down. The lighter side goes up."
Model the prediction process: "I'm going to compare this rock and this toy car. I predict the rock is heavier. Let me test my prediction." Place objects on the scale and discuss what you observe. Model recording your prediction and result.
Release children to their investigation stations. Provide guidance: "First, choose two objects. Next, predict which is heavier. Then, test on the scale. Finally, record what you discovered."
Circulate among children, asking questions to deepen thinking: "How did you know which was heavier? Were you surprised by any results? What do you think would happen if you tried these two objects?"
Gather children to share discoveries. Ask: "Did anyone make a prediction that turned out to be wrong? That's exciting because we learned something new!" Emphasize that scientists are happy when their predictions are wrong because it means they discovered something unexpected.
Conclude by weighing baking ingredients, connecting to the thematic unit: "Bakers need to weigh their ingredients carefully. Is flour heavier or lighter than sugar?"
Educator tip
Children often confuse size with weight. Use objects of similar size but different weights (a foam ball and a golf ball, for example) to highlight that size alone does not determine weight. This builds important conceptual understanding.
Assessment
Observe and note: ability to follow two-step instructions, use of new vocabulary in context, early problem-solving strategies, and sustained shared thinking episodes. Assess against Development Matters age-band expectations. Observe children's ability to make predictions and test them systematically. Note their understanding of weight concepts through their explanations. Document their use of scientific vocabulary.