Simple Experiment Design

Active learning transforms abstract ideas like variables and constants into tangible actions. For first-class students, moving marbles, straws, and paper teaches them that science is something they do, not just something they watch. These hands-on tasks make the rules of fair testing visible in real time.

• 1st Class
• Young Explorers: Investigating Our World
• 4 activities
• 25 min–40 min

Learning Objectives

1. Design a simple experiment to test how ramp height affects the distance a toy car travels.
2. Identify the independent variable (ramp height) and the dependent variable (distance traveled) in a controlled experiment.
3. Explain the concept of a 'fair test' by describing what needs to be kept the same and what should be changed.
4. Predict the outcome of a simple experiment based on a given hypothesis.

Problem-Based Learning

⏱ 30 min·Pairs

Pairs: Ramp Height Test

Pairs build ramps from books, test marble roll distance at three heights, measure with a ruler. One partner changes height only, the other records distance and notes constants like marble and floor. Switch roles, then share if test was fair.

Prepare & details

Explain the concept of a 'fair test' in an experiment.

Facilitation Tip: During the Ramp Height Test, circulate with a timer so pairs can repeat trials quickly but deliberately.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 35 min·Small Groups

Small Groups: Straw Blow Challenge

Groups test how straw length affects ping pong ball push distance on a table. Cut straws to different lengths, blow once per length, measure distance from start line. Discuss changed variable and what stayed same before retrying.

Prepare & details

Design a simple experiment to test a hypothesis.

Facilitation Tip: In the Straw Blow Challenge, remind groups to measure from the same starting line each time to control distance.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 40 min·Whole Class

Whole Class: Paper Airplane Fold

Class designs airplanes, tests one fold change like wing size across identical paper. Each launches five times, class averages distances on board. Vote on fair test elements as group.

Prepare & details

Identify the variable being changed and the variable being measured in an experiment.

Facilitation Tip: For the Paper Airplane Fold, model how to fold once, measure once, then adjust before folding again.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Problem-Based Learning

⏱ 25 min·Individual

Individual: Shadow Length Hunt

Each student tests toy position from light source for shadow length, changes distance only. Measure shadows with string, record in notebook. Share one fair test rule learned.

Prepare & details

Explain the concept of a 'fair test' in an experiment.

Facilitation Tip: On the Shadow Length Hunt, provide clipboards and stopwatches so students record length and time together.

Setup: Groups at tables with access to research materials

Materials: Problem scenario document, KWL chart or inquiry framework, Resource library, Solution presentation template

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Teaching This Topic

Start by modeling fair tests yourself with a think-aloud that names each part: the change, the measure, and the keep-sames. Avoid rushing to correct misconceptions; instead, set up peer checks where students compare their plans before testing. Research shows that children learn best when they articulate their own rules and then test them, rather than receiving explanations first.

What to Expect

By the end of these activities, students can identify the one changed variable and the measured outcome in a simple experiment. They will also explain why keeping most factors constant matters. You will see clear diagrams, labeled setups, and confident predictions during discussions.

Watch Out for These Misconceptions

Common Misconception

During the Ramp Height Test, watch for students who adjust both ramp height and marble size in the same trial.

What to Teach Instead

Stop the pair and ask them to choose only one thing to change. Have them cross out extra changes on their plan and explain why those must stay the same.

Common Misconception

During the Straw Blow Challenge, watch for groups who move the target or change the straw angle mid-test.

What to Teach Instead

Hand them a ruler and ask them to mark the floor with tape so the target and straw position stay fixed. Remind them to check before each blow.

Common Misconception

During the Paper Airplane Fold, watch for students who alter more than one fold at a time when testing.

What to Teach Instead

Ask them to fold once, test once, then fold again from the original crease. Label each plane with the fold count to track changes clearly.

Assessment Ideas

Quick Check

After the Ramp Height Test, present the scenario: 'We want to see if a heavier ball rolls farther than a lighter ball down a ramp.' Ask students to name the one thing to change, the one thing to measure, and two things to keep the same. Listen for the correct variables and constants.

Exit Ticket

After the Straw Blow Challenge, give students a card with the description: 'Testing which paper airplane flies farthest.' Ask them to write down the one thing to change, the one thing to measure, and two things to keep the same. Collect cards to check for accurate identification of variables.

Discussion Prompt

During the Paper Airplane Fold activity, show two setups: one where only the fold count changes, and another where both fold count and paper size change. Ask the class which setup will best answer the question about fold count and why. Listen for reasoning that ties fairness to isolating one variable.

Extensions & Scaffolding

• Challenge: Ask students to design a second test that changes a different variable in the same setup, then compare results.
• Scaffolding: Provide sentence starters like 'We changed ___, we measured ___, we kept ___ the same' on cards during planning.
• Deeper exploration: Introduce a simple graphing task where students plot their results and look for patterns in their data.

Key Vocabulary

Fair Test	An experiment where only one thing is changed at a time, and all other conditions are kept the same, so you know what caused the result.
Variable	A factor or condition in an experiment that can be changed or measured.
Independent Variable	The one factor that the scientist deliberately changes in an experiment to see what happens.
Dependent Variable	The factor that is measured or observed in an experiment to see if it is affected by the change.
Hypothesis	An educated guess or prediction about what will happen in an experiment before you start.