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.

• Grade 2
• Science
• 4 activities
• 25 min–45 min

Learning Objectives

1. Identify the direction of force applied to a simple fixed pulley system.
2. Compare the effort required to lift an object directly versus using a single fixed pulley.
3. Design a simple fixed pulley system to lift a small object.
4. Explain how a fixed pulley changes the direction of force.
5. Demonstrate the function of a fixed pulley in lifting an object.

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.

Prepare & details

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.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

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

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.

Prepare & details

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.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

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

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.

Prepare & details

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.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

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

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.

Prepare & details

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.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

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

Teaching This Topic

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.

What to Expect

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.

Watch Out for These Misconceptions

Common Misconception

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

What to Teach Instead

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.

Common Misconception

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

What to Teach Instead

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.

Common Misconception

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

What to Teach Instead

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.

Assessment Ideas

Exit Ticket

After the Demonstration: Flagpole Model, 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.

Quick Check

During the Pairs Challenge: Lift Comparison, 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?'

Discussion Prompt

After the Pairs Challenge: Lift Comparison, 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?'

Extensions & Scaffolding

• Challenge early finishers to create a pulley system for a heavier object, like a small book, and explain how they would adjust their design.
• For students who struggle, provide a pre-made pulley setup and ask them to trace the rope’s path with their finger before pulling.
• Deeper exploration: Have students research and sketch examples of real-world pulleys, like window blinds or cranes, and label the direction of force in each.

Key Vocabulary

Pulley	A wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt.
Force	A push or pull on an object that can cause it to move, stop, or change direction.
Direction	The path along which someone or something moves or lies.
Lift	To raise or move something to a higher position.