Science · Grade 2

Active learning ideas

Pulleys: Changing Direction of Force

Active learning helps students grasp how pulleys redirect force because hands-on experiences let them feel and see the change in direction for themselves. When students pull strings downward and watch objects rise, they connect abstract concepts to tangible outcomes, building stronger mental models of simple machines.

• Ontario Curriculum Expectations
• 3-PS2-1

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Experiential Learning
• 30 min · Whole Class

Demonstration: Flagpole Model

Construct a simple flagpole from a straw, tape, and string threaded through a fixed pulley (plastic spool). Attach a paper flag as the load. Have students take turns lifting the flag by pulling down on the string, then discuss how the downward pull feels easier than lifting straight up. Record observations on a class chart.

Analyze how a pulley helps lift a flag up a flagpole.

Facilitation Tip

During the Demonstration: Flagpole Model, position students in a half-circle around the model so everyone sees the rope’s path and the flag’s movement clearly.

What to look for

Provide students with a drawing of a simple fixed pulley lifting a box. Ask them to draw an arrow showing the direction of the force they would pull and write one sentence explaining how the pulley helped them lift the box.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 02

• Experiential Learning
• 25 min · Pairs

Pairs Challenge: Lift Comparison

Provide pairs with string, pulleys, and identical weights like small bags of beans. First, lift weights directly by hand. Then, rig a fixed pulley over a chair back and lift again. Pairs measure effort on a scale of 1-5 and share findings.

Design a simple pulley system to lift a small weight.

Facilitation Tip

For the Pairs Challenge: Lift Comparison, provide identical small weights and ask partners to alternate roles so both students experience direct lifting and pulley lifting.

What to look for

During a hands-on activity, observe students as they build and test their pulley systems. Ask: 'Show me how you are pulling the rope. Which way is the object moving? Is it easier to pull down or lift straight up?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Experiential Learning
• 45 min · Small Groups

Design Lab: Custom Pulley System

In small groups, students design a pulley to lift a toy from the floor to a desk using classroom materials like yarn, cups, and dowels. Test designs, adjust based on failures, and present the most effective system to the class.

Compare the effort needed to lift an object with and without a pulley.

Facilitation Tip

In the Design Lab: Custom Pulley System, limit materials to one string and one pulley to focus on direction change rather than complexity.

What to look for

Ask students to compare lifting a book directly off a table versus lifting it using a simple fixed pulley. Prompt them with: 'What felt different about the two ways of lifting? Why do you think pulling down felt easier than lifting straight up?'

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 04

• Stations Rotation
• 40 min · Small Groups

Stations Rotation: Pulley Types

Set up stations with fixed pulley lifts, movable pulley attempts, and no-pulley lifts. Groups rotate, predicting outcomes before testing, then drawing force direction arrows.

Analyze how a pulley helps lift a flag up a flagpole.

Facilitation Tip

At the Station Rotation: Pulley Types, prepare labeled images that show how each pulley looks and works before students test them.

What to look for

Provide students with a drawing of a simple fixed pulley lifting a box. Ask them to draw an arrow showing the direction of the force they would pull and write one sentence explaining how the pulley helped them lift the box.

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

A few notes on teaching this unit

Experienced teachers approach this topic by starting with a concrete demonstration that students can relate to, like a flagpole, before moving to hands-on challenges. They avoid overcomplicating the concept by limiting early activities to single fixed pulleys, focusing on direction change only. Research shows that repeated comparisons between direct lifting and pulley-assisted lifting help students notice the difference in effort and direction without confusion.

Successful learning looks like students explaining that a single fixed pulley changes the direction of force but does not reduce weight. They should confidently demonstrate pulling down to lift objects and compare the effort needed to lifting directly. Clear discussions and sketches show they understand the key idea.

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Watch Out for These Misconceptions

• During the Pairs Challenge: Lift Comparison, watch for students who believe the pulley makes the object weigh less.

  Ask them to compare the weight of the object held directly in their hands versus when it is lifted by the pulley. Have them feel the scale or spring scale readings to see the force remains similar.

• During the Demonstration: Flagpole Model, watch for students who assume they must always pull upward to lift objects.

  Have them physically pull the rope downward and describe how the flag moves upward. Ask them to trace the rope’s path with their finger to visualize the force redirection.

• During the Station Rotation: Pulley Types, watch for students who think adding more pulleys always makes lifting easier.

  Focus their attention on the single fixed pulley stations first. Ask them to test each pulley type and describe what they notice about the effort needed and the direction of force.

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Methods used in this brief

• Experiential Learning
• Stations Rotation