5E lesson plan
Why do some things float?
| Subject | Science | Grade | 3 |
|---|---|---|---|
| Date | Length | 55 minutes |
Standards
State science standard on forces, matter and properties of materials.
Learning objectives
Students will be able to predict whether an object will float or sink and explain their prediction using the words "heavy for its size" and "displace".
Materials and resources
Clear tub of water per table, two oranges (one peeled), set of test objects (cork, coin, crayon, foil ball, flat foil boat, apple slice, paper clip), prediction chart, towels
Engage (7 min)
Show two oranges. Ask the class to predict what will happen when each goes in the water. Drop in the unpeeled orange (floats), then the peeled one (sinks). Collect ideas: "Why?"
Explore (15 min)
Groups predict, then test each object, recording float/sink on the chart. Challenge: can you make the foil ball float without adding anything to it?
Explain (12 min)
Groups share patterns. Introduce "heavy for its size" (density in kid-friendly words) and how the peel holds air. Students revise their explanations.
Elaborate (14 min)
Design challenge: build a foil boat that holds the most paper clips. Students explain how the shape helps it float.
Evaluate (7 min)
Quick write: "A friend says big things always sink. Do you agree? Use evidence from today." Check against the objective.
Differentiation and accommodations
Word bank with pictures; sentence frame "I think it will ___ because ___". Extension: test the same object in salt water and explain the difference.
Planned time: 55 minutes of 55