Science · Kindergarten

Active learning ideas

Properties of Solids

Active learning helps young students connect abstract science vocabulary to the physical world. When children physically handle objects, they build durable memories of properties like texture and flexibility, which supports later classification work.

• Common Core State Standards
• K-PS2-1

• 15–30 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Stations Rotation
• 30 min · Small Groups

Hands-On Sorting: Properties Stations

Set up four stations with a collection of objects at each (wooden blocks, fabric scraps, rubber bands, metal spoons, sandpaper, cotton balls). At each station, students sort by a different property: texture, flexibility, hardness, or color. After rotating through all stations, students compare how the same object was sorted differently at each one.

Explain how we can group these objects based on how they feel.

Facilitation Tip

During Hands-On Sorting, circulate with a clipboard to listen for students’ reasoning and gently restate their observations using precise vocabulary like 'flexible' and 'rigid'.

What to look for

Provide each student with three small, distinct solid objects (e.g., a cotton ball, a small rock, a rubber band). Ask them to write one sentence describing the texture of each object and one sentence explaining if it is hard or soft.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: What Happens When It Gets Wet?

Hold up a paper towel, a plastic block, and a sponge. Ask students to predict what will change about each one if it gets wet, then discuss with a partner. After testing with a small amount of water, pairs share whether their predictions matched and what property changed.

Differentiate between objects that are hard and objects that are soft.

Facilitation Tip

For Think-Pair-Share, provide sentence stems such as 'When the paper towel gets wet, its texture changes from ____ to ____ because ____.' to scaffold discussion.

What to look for

Hold up two objects with contrasting properties, such as a smooth, hard block and a rough, flexible cloth. Ask students to point to the object that is 'bendable' and then to the object that is 'rough'.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 03

• Stations Rotation
• 15 min · Pairs

Mystery Bag Investigation

Place an unseen object in a fabric bag. Students reach in, feel the object, and use property vocabulary (hard, soft, smooth, rough, bumpy) to describe it to their partner before guessing what it might be. After the reveal, the class discusses which properties were most useful clues.

Predict how the properties of an object change when it gets wet.

Facilitation Tip

In Mystery Bag Investigation, model how to describe objects without naming them, using only properties so the class can guess the object.

What to look for

Present students with a collection of objects. Ask: 'How could we group these objects together? What property are you using to make your groups?' Encourage them to use vocabulary like texture, hard, soft, bendable, or rigid.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Begin with objects students already know, then introduce new vocabulary in context. Avoid worksheets at this stage because sorting physical objects builds stronger sensory memory than pictures. Research shows that children learn best when they move objects, talk about their observations, and repeat the process with unfamiliar materials.

Students will confidently name properties, sort objects by one or more properties, and explain why certain objects belong together. They will also notice that some properties change when objects get wet or are squeezed.

---

Watch Out for These Misconceptions

• During Think-Pair-Share, watch for students who assume properties can never change once an object dries.

  Have students test a paper towel before and after wetting it, then repeat the observation after it dries again. Ask them to describe what changed and what stayed the same.

• During Hands-On Sorting, watch for students who sort primarily by color instead of texture or flexibility.

  After their first color-based sort, ask them to try again using only texture. Compare the two groups and discuss which property helped them make groups that made sense.

• During Mystery Bag Investigation, watch for students who insist that objects in the same property group must look alike.

  Place a cotton ball and a stuffed animal in a bag labeled 'soft.' Ask students to feel both and explain why they belong together even though they look different.

---

Methods used in this brief

• Stations Rotation
• Think-Pair-Share